Conditional Sentence

As is typical for many languages, full conditional sentences in English consist of a condition clause or protasis specifying a condition or hypothesis, and a consequence clause or apodosis specifying what follows from that condition. The condition clause is a dependent clause, most commonly headed by the conjunction if, while the consequence is contained in the main clause of the sentence. Either clause may appear first.

Different types of conditional sentences (depending largely on whether they refer to a past, present or future time frame) require the use of particular verb forms (tenses and moods) to express the condition and the consequence. In English language teaching the most common patterns are referred to as first conditional, second conditional and third conditional; there is also a zero conditional and mixed conditional.

Imperative Mood

The imperative mood is a grammatical mood that forms a command or request.

An example of a verb used in the imperative mood is the English sentence Please be quiet. Such imperatives imply a second-person subject (you), but some other languages also have first- and third-person imperatives, with the meaning of let's (do something) or let him/her/them (do something) (the forms may alternatively be called cohortative and jussive.

Imperative mood can be denoted by the glossing abbreviation. It is one of the irrealis moods.

Formation

Imperative mood is often expressed using special conjugated verb forms. Like other finite verb forms, imperatives often inflect for person and number. Second-person imperatives (used for ordering or requesting performance directly from the person being addressed) are most common, but some languages also have imperative forms for the first and third persons (alternatively called cohortative and jussive respectively).

In English, the imperative is formed using the bare infinitive form of the verb (see verbs for more details). This is usually also the same as the second-person present indicative form, except in the case of the verb to be, where the imperative is be while the indicative is are. (The present subjunctive always has the same form as the imperative, although it is negated differently – the imperative is negated using do not, as in Don't touch me!) The imperative form is understood as being in the second person (the subject pronoun you is usually omitted, although it can be included for emphasis), with no explicit indication of singular or plural.

First and third person imperatives are expressed periphrastically, using a construction with the imperative of the verb let:

• Let us (Let's) have a drink! (equivalent to a first person plural imperative)
• Let him/her/them be happy! (equivalent to a third person imperative; constructions with may are also used)

Usage

Imperatives are used principally for ordering, requesting or advising the listener to do (or not to do) something: Put down the gun!; Pass me the sauce; Don't go too near the tiger. They are also often used for giving instructions as to how to perform a task (Install the file, then restart your computer). They can sometimes be seen on signs giving orders or warnings (Stop; Give way; Do not enter).

The use of the imperative mood may be seen as impolite, inappropriate or even offensive in certain circumstances. In polite speech, orders or requests are often phrased instead as questions or statements, rather than as imperatives:

• Could you come here for a moment? (more polite than Come here!)
• It would be great if you made us a drink. (for Make us a drink!)
• I have to ask you to stop. (for Stop!)

Politeness strategies (for instance, indirect speech acts) can seem more appropriate in order not to threaten a conversational partner in their needs of self-determination and territory: the partner's negative face should not appear threatened. As well as the replacement of imperatives with other sentence types as discussed above, there also often exist methods of phrasing an imperative in a more polite manner, such as the addition of a word like please or a phrase like if you could. Imperatives are also used for speech acts whose function is essentially not to make an order or request, but to give an invitation, give permission, express a wish, make an apology, etc.:

• Come to the party tomorrow! (invitation)
• Eat the apple if you want. (permission)
• Have a nice trip! (wish)
• Pardon me. (apology)
• Visit Estonia and Armenia! (advertisement)

When written, imperative sentences are often, but not always, terminated with an exclamation mark. First person plural imperatives (cohortatives) are used mainly for suggesting an action to be performed together by the speaker and the addressee (and possibly other people): Let's go to Barbados this year; Let us pray. Third person imperatives (jussives) are used to suggest or order that a third party or parties be permitted or made to do something: Let them eat cake; Let him be executed. There is an additional imperative form that is used for general prohibitions, consisting of the word no followed by the gerund form. The best known examples are No Smoking and No Parking. This form does not have a positive form; that is, Parking by itself has no meaning unless used as a noun when it tells that parking is permitted.

English usually omits the subject pronoun in imperative sentences:

• You work hard. (indicative)
• Work hard! (imperative; subject pronoun you omitted)

However, it is possible to include the you in imperative sentences for emphasis.

English imperatives are negated using don't (as in Don't work!) This is a case of do-support as found in indicative clauses; however in the imperative it applies even in the case of the verb be (which does not use do-support in the indicative):

• You are not late. (indicative)
• Don't be late! (imperative)

It is also possible to use do-support in affirmative imperatives, for emphasis or (sometimes) politeness: Do be quiet!; Do help yourself!.

The subject you may be included for emphasis in negated imperatives as well, following don't: Don't you dare do that again!

Infinitive

Regarding English, the term infinitive is traditionally applied to the unmarked form of the verb when it forms a non-finite verb, whether or not introduced by the particle to.

Hence sit and to sit, as used in the following sentences, would each be considered an infinitive:

• I can sit here all day.
• I want to sit on the other chair.

The form without to is called the bare infinitive; the form introduced by to is called the full infinitive or to-infinitive.

The other non-finite verb forms in English are the gerund or present participle (the -ing form), and the past participle – these are not considered infinitives.

Moreover, the unmarked form of the verb is not considered an infinitive when it is forms a finite verb: like a present indicative ("I sit every day"), subjunctive ("I suggest that he sit"), or imperative ("Sit down!"). (For some irregular verbs the form of the infinitive coincides additionally with that of the past tense and/or past participle, like in the case of put.)

Certain auxiliary verbs are defective in that they do not have infinitives (or any other non-finite forms).

This applies to the modal verbs (can, must, etc.), as well as certain related auxiliaries like the had of had better and the used of used to. (Periphrases can be employed instead in some cases, like (to) be able to for can, and (to) have to for must.) It also applies to the auxiliary do, like used in questions, negatives and emphasis like described under do-support. Infinitives are negated by simply preceding them with not.

Of course the verb do when forming a main verb can appear in the infinitive. However, the auxiliary verbs have (used to form the perfect) and be (used to form the passive voice and continuous aspect) both commonly appear in the infinitive: "I should have finished by now"; "It's thought to have been a burial site"; "Let him be released"; "I hope to be working tomorrow."

Perfect Infinitive

There are nonfinite constructions that are marked for perfect, progressive or perfect progressive aspect, using the infinitives, participles or gerunds of the appropriate auxiliaries. The meanings are as would be expected for the respective aspects: perfect for prior occurrence, progressive for ongoing occurrence at a particular time. (Passive voice can also be marked in nonfinite constructions – with infinitives, gerunds and present participles – in the expected way: (to) be eaten, being eaten, having been eaten, etc.)

Examples of nonfinite constructions marked for the various aspects are given below.

Bare infinitive:

• You should have left earlier. (perfect infinitive; for similar constructions and their meanings see modal verbs)
• She might be revising. (progressive; refers to an ongoing action at this moment)
• He must have been working hard. (perfect progressive; i.e. I assume he has been working hard)

To-infinitive:

• He is said to have resigned. (perfect infinitive)
• I expect to be sitting here this time tomorrow. (progressive)
• He claims to have been working here for ten weeks. (perfect progressive)

Present participle:

• Having written the letter, she went to bed. (perfect)
• The man having left, we began to talk. (perfect, in a nominative absolute construction)
• Having been standing for several hours, they were beginning to feel tired. (perfect progressive)

Past participle:

• We have been waiting a long time. (progressive, used only as part of a perfect progressive construction)

Gerund:

• My having caught the spider impressed the others. (perfect)
• We are not proud of having been drinking all night. (perfect progressive)

Other aspectual, temporal and modal information can be marked on nonfinite verbs using periphrastic constructions. For example, a "future infinitive" can be constructed using forms such as (to) be going to eat or (to) be about to eat.

Subject–auxiliary Inversion

Subject–auxiliary inversion involves placing the subject after a finite auxiliary verb, rather than before it as is the case in typical declarative sentences (the canonical word order of English being subject–verb–object).

Note that forms of the verb be are included regardless of whether or not they function as auxiliaries in the sense of governing another verb form.

A typical example of subject–auxiliary inversion is given below.

• Sam has read the paper. - Statement
• Has Sam read the paper? - Yes–no question formed using inversion

Here the subject is Sam, and the verb has is an auxiliary. In the question, these two elements change places (invert). If the sentence does not have an auxiliary verb, this type of simple inversion is not possible. Instead, an auxiliary must be introduced into the sentence in order to allow inversion:

• Sam enjoys the paper. - Statement with the non-auxiliary verb enjoys
• *Enjoys Sam the paper? - This is idiomatically incorrect; simple inversion with this type of verb is considered archaic
• Does Sam enjoy the paper? - The sentence formulated with the auxiliary does now allows inversion. For details of the use of do, did and does for this and similar purposes.

For exceptions to the principle that the inverted verb must be an auxiliary, see below.

It is also possible for the subject to invert with a negative contraction (can't, isn't, etc.). For example:

• He isn't nice.
• Isn't he nice? - The subject he inverts with the negated auxiliary contraction isn't.

Compare this with the uncontracted form Is he not nice? and the archaic Is not he nice?.

Subject–verb Inversion in English

Subject–verb inversion in English is a type of inversion where the subject and verb (or chain of verbs, verb catena) switch their canonical order of appearance, so that the subject follows the verb(s), e.. A lamp stood beside the bed → Beside the bed stood a lamp. Subject–verb inversion is distinct from subject–auxiliary inversion because the verb involved is not an auxiliary verb.

Irregular Verbs

The English language has a large number of irregular verbs, approaching 200 in normal use—and significantly more if prefixed forms are counted. In most cases, the irregularity concerns the past tense (also called preterite or the past participle.

The other inflected parts of the verb—the third person singular present indicative in -[e]s, and the present participle and gerund form in -ing—are formed regularly in most cases. There are a few exceptions: the verb be has irregular forms throughout the present tense; the verbs have, do, go and say have irregular -[e]s forms; and certain defective verbs (such as the modal auxiliaries) lack most inflection.

The irregular verbs include many of the most common verbs: the dozen most frequently used English verbs are all irregular. New verbs (including loans from other languages, and nouns employed as verbs) usually follow the regular inflection, unless they are compound formations from an existing irregular verb (such as housesit, from sit).

Irregular verbs in Modern English typically derive from verbs that followed more regular patterns at a previous stage in the history of the language. In particular, many such verbs derive from Germanic strong verbs, which make many of their inflected forms through vowel gradation, as can be observed in Modern English patterns such as sing–sang–sung. The regular verbs, on the other hand, with their preterites and past participles ending in -ed, follow the weak conjugation, which originally involved adding a dental consonant (-t or -d). Nonetheless, there are also many irregular verbs that follow or partially follow the weak conjugation.

For information on the conjugation of regular verbs in English, as well as other points concerning verb usage, see verbs.

Strong Verbs

A large number of the irregular verbs derive from Germanic strong verbs, which display the vowel shift called ablaut, and do not add an ending such as -ed or -t for the past forms. These sometimes retain past participles with the ending -[e]n, as in give–gave–given and ride–rode–ridden, but in other cases this ending has been dropped, as in come–came–come and sing–sang–sung. This verb group was inherited from the parent Proto-Germanic language, and before that from the Proto-Indo-European language. It was originally a system of regular verbs, and in modern German the system remains more or less regular; however in Modern English relatively few verbs continue to follow such a pattern, and they are classed as irregular.

Verbs that retain a strong-type inflection in modern English and add -[e]n in the past participle include bear, beat, beget, bite, blow, break, choose, cleave, draw, drive, eat, fall, fly, forbid, forget, forsake, freeze, give, grow, know, lie, ride, rise, see, shake, shear, slay, smite, speak, steal, stride, strive, swear, take, tear, throw, tread, wake, weave, and write.

Those that do not add -[e]n in the usual past participle include become, begin, bind, burst, cling, come, drink, fight, find, fling, get (but with past participle gotten in American English), grind, hang, hold, let, ring, run, seek, shed, shine, shit, shoot, shrink, sing, sink, sit, slide, sling, slink, slit, spin, spring, stand, sting, stink, strike, swim, swing, win, wind and wring.

The verbs sow and swell are now usually regular in the past tense, but retain the strong-type past participles sown and swollen. Other verbs retain participles in -n for certain adjectival uses, such as drunken and sunken. The verb crow is now regular in the past participle, but the strong past tense crew is sometimes used.

Some originally weak verbs have taken on strong-type forms by analogy with strong verbs. These include dig, dive (when dove is used as the past tense), hide, mow, prove (when proven is used as the past participle), saw (past participle sawn), sew (past participle sewn), show (past participle shown), spit, stick, strew, string, and wear (analogy with bear).

Weak Verbs

Some other irregular verbs derive from Germanic weak verbs, forming past tenses and participles with a -d or -t ending (or from originally strong verbs that have switched to the weak pattern). The weak conjugation is also the origin of the regular verbs in -ed; however various historical sound changes (and sometimes spelling changes) have led to certain types of irregularity in some verbs. The main processes are as follows (some verbs have been subject to more than one of these).

• Some weak verbs with long vowels in their present tense stems (such as keep) took a short vowel in the past tense and past participle (kept).
• In some weak verbs ending in a final -t or -d, this final consonant coalesced (contracted) with the weak past ending to leave a single -t or -d in the past forms.
• Some verbs ending in l or n had their past ending irregularly devoiced to -t, and in a few verbs ending with a v or z sound (leave, lose), both that sound and the past ending were devoiced. (The regular ending -ed is also devoiced after voiceless consonants in regular verbs, as described under, but this is not now shown in the spelling – for example, the -ed in blessed and whipped is pronounced as a t, and these words were formerly written blest and whipt. The spelling -t following a voiceless consonant is retained for verbs that display an irregularity, as in kept and cost.)
• Some weak verbs continue the vowel shift called Rückumlaut ("reverse umlaut"); those with -gh- in the spelling were also affected by the Germanic spirant law.
• A few weak verbs have undergone additional contractions or vowel shortenings in their past or present tense forms.
• A few verbs are regular in their spoken forms, but have irregular spelling.

The irregular weak verbs (being in normal use) can consequently be grouped as follows:

For weak verbs that have adopted strong-type past tense or past participle forms, see the section above on strong verbs.

More information on the development of some of the listed verbs can be found at List of irregular verbs.

• Verbs with vowel shortening: creep, flee, hear, keep, leap, shoe (when shod is used), sleep, sweep and weep. (Of these, creep, flee, leap, sleep and weep derive from verbs that were originally strong.)
• Verbs with vowel shortening and devoicing of the ending: deal, dream, feel, kneel, lean, leave, lose (originally strong) and mean. Some of the verbs in this and in the preceding group have alternative regular forms, such as dreamed and leaped.
• Verbs with coalescence of consonants: bet, bid, cast, cost, cut, fit, hit, hurt, knit, put, quit, rid, set, shed, shut, split, spread, thrust, wed and wet. Some of these verbs have alternative regular forms, such as wedded and wetted. (The verb hoist behaves similarly to verbs in this group, but this was originally itself a past form of the now obsolete verb hoise; similarly clad was originally – and sometimes still is – a past form of clothe.)
• Verbs with coalescence of consonants and devoicing of the ending: bend, build, lend, rend, send, spend.
• Verbs with coalescence of consonants and vowel shortening: bleed, breed, feed, lead, light, meet, read (past tense and past participle also spelt read, but pronounced with a short vowel), and speed.
• Verbs with devoicing of the ending and no other irregularity: burn, dwell, learn, smell, spell, spill and spoil. Most of these have regular -ed forms as alternatives.
• Verbs continuing the Rückumlaut pattern: bring–brought, buy–bought, seek–sought, sell–sold, teach–taught, tell–told, and think–thought. The borrowed verb catch (caught) has also fallen into this pattern as a result of analogy.
• Verbs with additional contractions and shortenings: have–has–had, make–made, say–says–said (where says and said are pronounced with a short vowel ). (The verb do has a similar vowel shortening in does and done)
• Verbs irregular only in spelling: lay–laid, pay–paid (although in the meaning "let out", of a rope etc., pay may have the regular spelling payed).

Anomalous Cases

The following verbs do not fit exactly into any of the above categories:

• The modal verbs, which are defective verbs – they have only a present indicative form and (in some cases) a preterite, lacking nonfinite forms (infinitives, participles, gerunds), imperatives, and subjunctives (although some uses of the preterites are sometimes identified as subjunctives). Moreover, they do not add -s in the third person singular – this is because they derive either from preterites, or from Germanic preterite-present verbs, which were conjugated using the (strong-type) preterite form with present tense meaning. (Additional "true" preterites with past tense meaning were formed with the addition of dentals in the manner of the weak verbs.) The chief verbs of this class are can–could, may–might, shall–should, will–would, and must and ought (These last two have no preterites. They were originally preterites themselves). There are also dare and need, which follow the same pattern (no -s) in some contexts: "Dare he jump? She needn't worry" (dare derives from a preterite-present verb, but need is from an Old English regular verb).
• Two verbs (be and go) that contain suppletive forms, i.e. one or more of their parts came from an entirely different root. With go this applies to the past tense went, which is originally from the verb wend. With be it applies to a number of different forms. Derived from be is the defective verb beware, which does not inflect in normal use and which appears only in those forms in which the plain form of be would be used, namely the infinitive, the imperative, and the subjunctive.
• The verb do, which has the reduplicated form did for its past tense (an irregularity that can be traced back to Proto-Germanic). Its past participle done can be compared to typical strong participles in -[e]n; however both this and the third person present tense does feature a short vowel in modern pronunciation.

Verbs With Irregular Present Tenses

Apart from the modal verbs, which are irregular in that they do not take an -s in the third person, the only verbs with irregular present tense forms are be, do, have and say (and prefixed forms of these, such as undo and gainsay, which conjugate in the same way as the basic forms).

The verb be has multiple irregular forms. In the present indicative it has am in the first person singular, is in the third person singular, and are in the plural and second person singular. (Its present subjunctive is be, as in "I suggest that you be extremely careful", though that is not irregular, as all verbs use the infinitive/imperative form for the present subjunctive.) It also has two past tense forms: was for the first and third persons singular, and were for the plural and second person singular (although there are certain subjunctive uses in which were can substitute for was). The past participle is been, and the present participle and gerund forms are regular: being.

As mentioned above, apart from its other irregularities, the verb do has the third person present indicative does pronounced with a short vowel.

The verb have has a contracted third person present indicative form: has. This is formed similarly to the verb's past tense had.

The verb say displays vowel shortening in the third person present indicative (although the spelling is regular): says . The same shortening occurs in the past form said . (Compare the diphthong in the plain form say .)

Coincident Forms

In regular English verbs, the past tense and past participle have the same form. This is also true of most irregular verbs that follow a variation of the weak conjugation, as can be seen in the list below. Differences between the past tense and past participle (as in sing–sang–sung, rise–rose–risen) generally appear in the case of verbs that continue the strong conjugation, or in a few cases weak verbs that have acquired strong-type forms by analogy—as with show (regular past tense showed, strong-type past participle shown). However, even some strong verbs have identical past tense and participle, as in cling–clung–clung.

In some verbs, the past tense, past participle, or both are identical in form to the basic (infinitive) form of the verb. This is the case with certain strong verbs, where historical sound changes have led to a leveling of the vowel modifications: for example, let has both past tense and past participle identical to the infinitive, while come has the past participle identical (but a different past tense, came). The same is true of the verbs listed above under as having undergone coalescence of final consonants (and without other irregularities such as vowel shortening or devoicing of the ending): bet, bid, etc. (these verbs have infinitive, past tense and past participle all identical, although some of them also have alternative regular forms in -ed). The verb read has the same spelling in all three forms, but not the same pronunciation, as it exhibits vowel shortening.

In a few cases the past tense of an irregular verb has the same form as the infinitive of a different verb. For example, bore and found may be past tenses of bear and find, but may also represent independent (regular) verbs of different meaning. Another example is lay, which may be the past tense of lie, but is also an independent verb (regular in pronunciation, but with irregular spelling: lay–laid–laid). In fact lay derives from a causative of the verb from which lie derives. The two verbs are sometimes confused, with lay used in the intransitive senses prescriptively reserved for lie.

Prefixed Verbs

Nearly all of the basic irregular verbs are single-syllable words. (Their irregular inflected forms are normally single-syllable also, except for the past participles in -en like chosen and risen.) However many additional irregular verbs are formed by adding prefixes to the basic ones: understand from stand, become from come, mistake from take, and so on. (These prefixed forms are generally omitted from the list below, but a large number appear in the table at List of English irregular verbs.) As a general rule, prefixed verbs are conjugated identically to the corresponding basic verbs; for example, we have understand–understood–understood and become–became–become, following the patterns of stand–stood–stood and come–came–come. However, there are occasional differences: in British English, for instance, the past participle of get is got, while that of forget is forgotten.

Only a few irregular verbs of more than one syllable cannot be analyzed as prefixed compounds of monosyllables. The only ones in normal use are begin–began–begun and forsake–forsook–forsaken (these both derive from prefixed verbs whose unprefixed forms have not survived into Modern English). There is also beseech–besought–besought (this is from Old English besēcan "to seek or inquire about", making it equivalent to be- + seek, but it has moved away from seek in both form and meaning); however the form besought is now archaic, the verb normally being conjugated regularly (beseeched).

List

The following is a list of 204 irregular verbs that are commonly used in standard modern English. It omits many rare, dialectal, and archaic forms, as well as most verbs formed by adding prefixes to basic verbs (unbend, understand, mistake, etc.).

It also omits past participle forms that remain in use only adjectivally (clad, sodden, etc.).

The list that follows shows the base, or infinitive form, the past tense and the past participle of the verb.

• a- : for abide, arise, awake, see bide, rise, wake
• be (am, is, are) – was, were – been
• be- : for become, befall, beset, etc. see come, fall, set, etc.
• bear – bore – borne spelt born in passive and adjectival uses relating to birth
• beat – beat – beaten
• beget – begot – begot(ten) [Biblical past tense: begat]
• begin – began – begun
• bend – bent – bent
• bet – bet – bet [past tense and participle also sometimes betted]
• beware – defective verb [see anomalous cases above]
• bid – bid – bid [as in an auction]
• bid – bade/bid – bidden/bid [meaning "request"]
• bide – bided/bode – bided/bidden [but abide mostly uses the regular forms only]
• bind – bound – bound
• bite – bit – bitten
• bleed – bled – bled
• blow – blew – blown
• break – broke – broken
• breed – bred – bred
• bring – brought – brought
• build – built – built
• burn – burnt/burned – burnt/burned
• burst – burst – burst
• buy – bought – bought
• can – could [defective; see anomalous cases above]
• cast – cast – cast [prefixed forms broadcast, forecast, etc. sometimes take -ed ]
• catch – caught – caught
• choose – chose – chosen
• clad – clad/cladded – clad/cladded [clad is also sometimes used as past form of clothe]
• cleave – clove/cleft – cloven/cleft [but regular when meaning "adhere"]
• cling – clung – clung
• come – came – come
• cost – cost – cost [but regular when meaning "calculate the cost of"]
• creep – crept/creeped – crept/creeped
• crow – crowed/crew – crowed [crew normally used only of a cock's crowing]
• cut – cut – cut
• dare – regular except for possible third person singular present dare (see anomalous cases above)
• deal – dealt – dealt
• dig – dug – dug
• dive – dived/dove – dived [the form dove is chiefly American]
• do (does ) – did – done
• drag – *dragged/drug – *dragged/drug* [the form drug is chiefly dialectal]
• draw – drew – drawn
• dream – dreamed/dreamt – dreamed/dreamt
• drink – drank – drunk
• drive – drove – driven
• dwell – dwelt/dwelled – dwelt/dwelled
• eat – ate – eaten
• fall – fell – fallen
• feed – fed – fed
• feel – felt – felt
• fight – fought – fought
• find – found – found
• fit – fit/fitted – fit/fitted
• flee – fled – fled
• fling – flung – flung
• fly – flew – flown [the form flied is common in the baseball sense]
• for(e)- : for forgo, foresee, etc. see go, see, etc.
• forbid – forbade/forbid – forbidden
• forget – forgot – forgotten
• forsake – forsook – forsaken
• freeze – froze – frozen
• get – got – gotten/got* past participle got in British English, gotten in American, but see *have got*
• gild – gilded/gilt – gilded/gilt
• give – gave – given
• go) – went – gone see also [have been]
• grind – ground – ground
• grow – grew – grown
• hang – *hung/hanged – *hung/hanged* the form hanged is more common in the sense of [execution by hanging]
• have (has) – had – had
• hear – heard – heard
• hew – hewed – hewn/hewed
• hide – hid – hidden
• hit – hit – hit
• hoist – hoist/hoisted – hoist/hoisted
• hold – held – held
• hurt – hurt – hurt
• in- : for inlay, input, etc. see lay, put, etc.
• inter- : for interlay, interweave, etc. see lay, weave, etc.
• keep – kept – kept
• kneel – knelt/kneeled – knelt/kneeled
• knit – knit/knitted – knit/knitted
• know – knew – known
• lay – laid – laid
• lead – led – led
• lean – leaned/leant – leaned/leant
• leap – leaped/leapt – leaped/leapt
• learn – learned/learnt – learned/learnt
• leave – left – left
• lend – lent – lent
• let – let – let
• lie – lay – lain [but regular when meaning "tell an untruth"]
• light – lit/lighted – lit/lighted
• lose – lost – lost
• make – made – made
• may – might [defective; see anomalous cases above]
• mean – meant – meant
• meet – met – met
• mis- : for misspeak, mistake, etc. see speak, take, etc.
• mow – mowed – mowed/mown
• must – defective [see anomalous cases above]
• need – regular except for possible third person singular present need (see anomalous cases above)
• off- : for offset see set, etc.
• ought – defective [see anomalous cases above]
• out- : for outbid, output, etc. see bid, put, etc.
• over- : for overbid, overdo, etc. see bid, do, etc.
• pay – paid – paid [but sometimes spelt regularly when meaning "let out" (rope etc.)]
• plead – pleaded/pled – pleaded/pled
• pre- : for prepay, preset, etc. see pay, set, etc.
• prove – proved – proved/proven
• put – put – put
• quit – quit – quit
• re- : for redo, remake, etc. see do, make, etc.
• read – read – read
• rend – rent – rent
• rid – rid/ridded – rid/ridded/ridden
• ride – rode – ridden
• ring – rang – rung
• rise – rose – risen
• run – ran – run
• saw – sawed – sawn/sawed
• say (says ) – said – said
• see – saw – seen
• seek – sought – sought
• sell – sold – sold
• send – sent – sent
• set – set – set
• sew – sewed – sewn/sewed
• shake – shook – shaken
• shall – should [defective; see anomalous cases above]
• shear – sheared/shore – shorn/sheared
• shed – shed – shed
• shine – shone/shined – shone/shined
• shit – shat/shit/shitted – shat/shit/shitted
• shoe – shoed/shod – shoed/shod
• shoot – shot – shot
• show – showed – shown/showed
• shrink – *shrank/shrunk – *shrunk*
• shrive – shrove – shriven
• shut – shut – shut
• sing – sang – sung
• sink – sank – sunk
• sit – sat – sat
• slay – slew/slayed – slain/slayed
• sleep – slept – slept
• slide – slid – slid
• sling – slung – slung
• slink – slunk – slunk
• slit – slit – slit
• smell – smelled/smelt – smelled/smelt
• smite – smote – smitten
• sneak – *sneaked/snuck – *sneaked/snuck* [snuck is chiefly American, is regarded as informal and is only cited from 1887 ]
• sow – sowed – sown/sowed
• speak – spoke – spoken
• speed – sped/speeded – sped/speeded
• spell – spelled/spelt – spelled/spelt
• spend – spent – spent
• spill – spilled/spilt – spilled/spilt
• spin – spun – spun
• spit – spat/spit* – *spat/spit* [the form spit rather than spat is common in America]
• split – split – split
• spoil – spoiled/spoilt – spoiled/spoilt
• spread – spread – spread
• spring – *sprang/sprung – *sprung*
• stand – stood – stood
• stave – staved/stove – staved/stove
• steal – stole – stolen
• stick – stuck – stuck
• sting – stung – stung
• stink – stank – stunk
• strew – strewed – strewn/strewed
• stride – strode – stridden/strode
• strike – struck – struck/stricken
• string – strung – strung
• strive – strove/strived – striven/strived
• swear – swore – sworn
• sweat – sweated/sweat – sweated/sweat
• sweep – swept – swept
• swell – swelled – swollen/swelled
• swim – swam – swum
• swing – swung – swung
• take – took – taken
• teach – taught – taught
• tear – tore – torn
• tell – told – told
• think – thought – thought
• thrive - thrived/throve - thrived/thriven
• throw – threw – thrown
• thrust – thrust/thrusted – thrust/thrusted
• tread – trod – trodden/trod
• un- : for unbend, unweave, etc. see bend, weave, etc.
• under- : for underlie, undergo, understand, etc. see lie, go, stand, etc.
• up- : for upset see set, etc.
• wake – woke – woken
• wear – wore – worn
• weave – wove – woven
• wed – wed/wedded – wed/wedded
• weep – wept – wept
• wet – wet/wetted – wet/wetted
• will – would [defective; see anomalous cases above]
• win – won – won
• wind – wound – wound [but regular in the meanings connected with air and breath]
• with- : for withdraw, withhold, withstand, see draw, hold, stand
• wring – *wrang/wrung – *wrung*
• write – wrote – written

Object

Traditional grammar defines the object in a sentence as the entity that is acted upon by the subject. There is thus a primary distinction between subjects and objects that is understood in terms of the action expressed by the verb, e.g. Tom studies grammar—Tom is the subject and grammar is the object. Traditional theories of sentence structure divide the simple sentence into a subject and a predicate, whereby the object is taken to be part of the predicate. Many modern theories of grammar (e.g. dependency grammars), in contrast, take the object to be a verb argument like the subject, the difference between them being mainly just their prominence; the subject is ranked higher than the object and is thus more prominent.

The main verb in a clause determines whether and what objects are present. Transitive verbs require the presence of an object, whereas intransitive verbs block the appearance of an object. The term complement overlaps in meaning with object: all objects are complements, but not vice versa. The objects that verbs do and do not take is explored in detail in valency theory.

Types

Various object types are commonly acknowledged: direct, indirect, and prepositional. These object types are illustrated in the following table:

The descriptions "entity acted upon" and "entity indirectly affected by the action" are merely loose orientation points. Beyond basic examples such as those provided in the table, these orientation points are not much helpful when the goal is to determine whether a given object should be viewed as direct or indirect. One rule of thumb for English, however, is that an indirect object is not present unless a direct object is also present. A prepositional object is one that is introduced by a preposition. Despite the difficulties with the traditional nomenclature, the terms direct object and indirect object are widespread.

The term oblique object is also employed at times, although what exactly is meant varies from author to author. Some understand it to be an umbrella term denoting all objects (direct, indirect, and prepositional), whereas others use the term to denote just a prepositional object.

Syntactic Category

While the typical object is a pronoun, noun, or noun phrase, objects can also appear as other syntactic categories, as illustrated in the following table:

Identification

A number of criteria can be employed for identifying objects, e.g: The object follows the subject. Languages vary significantly with respect to these criteria. The first criterion identifies objects reliably most of the time in English, e.g.

Fred gave me a book.

• a. A book was given (to) me. — Passive sentence identifies a book as an object in the starting sentence.
• b. I was given a book. — Passive sentence identifies me as an object in the starting sentence.

The second criterion is also a reliable criterion for isolating languages such as English, since the relatively strict word order of English usually positions the object after the verb(s) in declarative sentences.

The third criterion is less applicable to English, though, since English lacks morphological case, exceptions being the personal pronouns (I/me, we/us, he/him, she/her, they/them).

Verb Classes

Verbs can be classified according to the number and/or type of objects that they do or do not take. The following table provides an overview of some of the various verb classes:

Ergative and object-deletion verbs can be transitive or intransitive, as indicated in the following table:

The distinction drawn here between ergative and object-deletion verbs is based on the role of the subject. The object of a transitive ergative verb is the subject of the corresponding intransitive ergative verb. With object-deletion verbs, in contrast, the subject is consistent regardless of whether an object is or is not present.

Participle

Participles are verb forms that do double duty — they help build tenses and voices, but they also work as adjectives and adverbs. Understanding both types of participles is essential for forming correct verb tenses, using the passive voice, and writing more sophisticated sentences.

The Two Participles

English has two participles:

1. Present participle — formed by adding -ing to the base verb: doing, running, sleeping. It's identical in form to the gerund, but serves a different function (more on that below).
2. Past participle — for regular verbs, it's the -ed form (walked, boiled). For irregular verbs, it varies widely: done, written, sung, gone.

How the Present Participle Is Used

• Progressive tenses: She is reading a book.
• As an adjective: The woman sitting by the window is my boss.
• As an adverb: Looking up from his phone, he noticed the bus had arrived.
• In absolute constructions (with its own subject): The weather being terrible, we cancelled the trip.

Present participles used as adjectives carry an active meaning — an exciting movie is one that excites you.

How the Past Participle Is Used

• Perfect tenses: They have finished the project.
• Passive voice: The email was sent this morning.
• As an adjective: The broken window needs replacing.
• Adverbially: Exhausted from the hike, we fell asleep immediately.

Past participles used as adjectives usually carry a passive meaning — the attached file is one that has been attached. However, past participles of intransitive verbs can have active meaning: fallen leaves (leaves that have fallen).

Participle vs. Gerund

Both the present participle and the gerund end in -ing, but they do different jobs. The participle acts as an adjective or adverb; the gerund acts as a noun.

• ✅ Swimming in the lake, she felt completely free. (participle — describes she)
• ✅ Swimming is her favourite hobby. (gerund — subject of the sentence)

The famous example Flying planes can be dangerous is ambiguous: flying could be a gerund ("the activity of flying planes") or a participle ("planes that fly").

Self-check: If you can replace the -ing word with a noun like "it" or "the activity," it's a gerund. If it describes a noun or tells you more about an action, it's a participle.

Watch Out: Past Tense vs. Past Participle

For regular verbs, the past tense and past participle look the same (walked, played). For many irregular verbs, they differ:

• ✅ I went home early. (past tense)
• ✅ I have gone home early. (past participle)
• ❌ I should have went home early.

If you're unsure, check whether the verb follows a helping word like have, has, or had — if it does, you need the past participle form.

Ready to practise? Try Gerund vs. Participle: Understanding -ing Word Functions, Participle Clauses: Shortening Sentences with -ing and Having + Past Participle, or Participle vs Gerund.

Simple Past

The simple past, past simple or past indefinite, sometimes called the preterite, is the basic form of the past tense in Modern English. It is used principally to describe events in the past, although it also has some other uses. Regular English verbs form the simple past in -ed; however there are a few hundred irregular verbs with different forms.

The term "simple" is used to distinguish the syntactical construction whose basic form uses the plain past tense alone, from other past tense constructions which use auxiliaries in combination with participles, such as the past perfect and past progressive.

Formation

Regular verbs form the simple past end*-ed*; however there are a few hundred irregular verbs with different forms. For details see.

Most verbs have a single form of the simple past, independent of the person or number of the subject (there is no addition of -s for the third person singular as in the simple present).

However, the copula verb be has two past tense forms: was for the first and third persons singular, and were in other instances.

The form were can also be used in place of was in conditional clauses and the like; for information on this, see subjunctive.

This is the only case in modern English where a distinction in form is made between the indicative and subjunctive moods in the past tense.

Questions, other clauses requiring inversion, negations with not, and emphatic forms of the simple past use the auxiliary did.

A full list of forms is given below, using the (regular) verb help as an example:

• Basic simple past:
  • I/you/he/she/it/we/they helped
• Expanded (emphatic) simple past:
  • I/you/he/she/it/we/they did help
• Question form:
  • Did I/you/he/she/it/we/they help?
• Negative:
  • I/you/he/she/it/we/they did not (didn't) help
• Negative question:
  • Did I/you/he/she/it/we/they not help? / Didn't I/you/he/she/it/we/they help?

Usage

The simple past is used for a single event (or sequence of such events) in the past, and also for past habitual action:

• He took the money and ran.
• I visited them every day for a year.

It can also refer to a past state:

• I knew how to fight even as a child.

For action that was ongoing at the time referred to, the past progressive is generally used instead (e.g. I was cooking). The same can apply to states, if temporary (e.g. the ball was lying on the sidewalk), but some stative verbs do not generally use the progressive aspect at all, and in these cases the simple past is used even for a temporary state:

• The dog was in its kennel.

However, with verbs of sensing, it is common in such circumstances to use could see in place of saw, could hear in place of heard, etc.

• I felt cold.

If one action interrupts another, then it is usual for the interrupted (ongoing) action to be expressed with the past progressive, and the action that interrupted it to be in the simple past:

• Your mother called while you were cooking.

The simple past is often close in meaning to the present perfect.

The simple past is used when the event happened at a particular time in the past, or during a period which ended in the past (i.e. a period that does not last up until the present time).

This time frame may be explicitly stated, or implicit in the context (for example the past tense is often used when describing a sequence of past events).

• I was born in 1980.
• We turned the oven off two minutes ago.
• I came home at 6 o'clock.
• When did they get married?
• We wrote two letters this morning.
• She placed the letter on the table, sighed, and left the house.Contrast these examples with those given at.

Note also that for past actions that occurred before the relevant past time frame, the past perfect is used.

Various compound constructions exist for denoting past habitual action.

The sentence When I was young, I played football every Saturday might alternatively be phrased using used to (... I used to play ...) or using would (... I would play...).

The simple past also has some uses in which it does not refer to a past time.

• If he walked faster, he would get home earlier.
• I wish I knew what his name was.

These are generally in condition clauses and some other dependent clauses referring to hypothetical circumstances, as well as certain expressions of wish:

• He said he wanted to go on the slide.

Past Progressive

The past progressive or past continuous construction combines progressive aspect with past tense, and is formed using the past tense of be (was or were) with the present participle of the main verb.

It indicates an action that was ongoing at the past time being considered:

• At three o'clock yesterday, I was working in the garden. For stative verbs that do not use the progressive aspect, the simple past is used instead (At three o'clock yesterday we were in the garden).

The past progressive is often used to denote an action that was interrupted by an event, or for two actions taking place in parallel:

• While I was washing the dishes, I heard a loud noise.
• While you were washing the dishes, Sue was walking the dog.(Interrupted actions in the past can also sometimes be denoted using the past perfect progressive.)

The past progressive can also be used to refer to past action that occurred over a range of time and is viewed as an ongoing situation:

• I was working in the garden all day yesterday. That could also be expressed using the simple past, as I worked..., which implies that the action is viewed as a unitary event (although the effective meaning is not very different).

Past Perfect

The past perfect, sometimes called the pluperfect, combines past tense with perfect aspect; it is formed by combining had (the past tense of the auxiliary have) with the past participle of the main verb.

It is used when referring to an event that took place prior to the time frame being considered.

This time frame may be stated explicitly, as a stated time or the time of another past action:

• We had finished the job by 2 o'clock.
• He had already left when we arrived.

The time frame may also be understood implicitly from the previous or later context:

• I was eating ... I had invited Jim to the meal but he was unable to attend. (i.e. I invited him before I started eating)
• I had lost my way. (i.e. this happened prior to the time of the past events I am describing or am about to describe)

Compare He had left when we arrived (where his leaving preceded our arrival), with the form with the simple past, He left when we arrived (where his leaving was concurrent with or shortly after our arrival).

Note that unlike the present perfect, the past perfect can readily be used with an adverb specifying a past time frame for the occurrence.

For example, while it is incorrect to say I have done it last Friday (the use of last Friday, specifying the past time, would require the simple past rather than the present perfect), there is no such objection to a sentence like "I had done it the previous Friday".

The past perfect can also be used for states or repeated occurrences pertaining over a period up to a time in the past, particularly in stating "for how long" or since when". However, if the state is temporary and the verb can be used in the progressive aspect, the past perfect progressive would normally be used instead. Some examples with the plain past perfect:

• I had lived in that house for 10 years.
• The children had been in their room since lunchtime.

Past Perfect Progressive

The past perfect progressive or past perfect continuous (also known as the pluperfect progressive or pluperfect continuous) combines perfect progressive aspect with past tense.

It is formed by combining had (the past tense of auxiliary have), been (the past participle of be), and the present participle of the main verb.

Uses of the past perfect progressive are analogous to those of the present perfect progressive, except that the point of reference is in the past.

For example:

• I was tired because I had been running.
• By yesterday morning they had already been working for twelve hours.
• Among the witnesses was John Smith, who had been staying at the hotel since July 10.

This form is sometimes used for actions in the past that were interrupted by some event (compare the use of the past progressive as given above).

For example:

• I had been working on my novel when she entered the room to talk to me.

This implies that I stopped working when she came in (or had already stopped a short time before); the plain past progressive (I was working...) would not necessarily carry this implication.

If the verb in question does not use the progressive aspect, then the plain past perfect is used instead.

The past perfect progressive may also have additional specific uses similar to those of the plain past perfect.

Simple Present

The simple present or present simple is a form that combines present tense with "simple" (neither perfect nor progressive) aspect.

In the indicative mood it consists of the base form of the verb, or the -s form when the subject is third-person singular (the verb be uses the forms am, is, are). However, with non-auxiliary verbs it also has a periphrastic form consisting of do (or third-person singular does) with the bare infinitive of the main verb — this form is used in questions (and other clauses requiring inversion and negations, and sometimes for emphasis.

The principal uses of the simple present are given below.

To refer to an action or event that takes place habitually. Such uses are often accompanied by frequency adverbs and adverbial phrases such as always, often, from time to time and never.
Examples:

• I always take a shower.
• He writes for a living.

This contrasts with the present progressive, which is used for actions taking place at the present moment.

With stative verbs in senses that do not use progressive aspect, to refer to a present or general state, whether temporary, permanent or habitual. (In senses that do use progressive aspect, the present simple is used when the state is permanent or habitual.)

• You are happy.
• I know what to do.
• Denmark lies to the north of Germany.

When quoting someone or something, even if the words were spoken in the (usually very recent) past:

• The label says "External use only".
• Mary says she's ready.

To refer to a single completed action, as in recounting the events of a story in the present tense (see historical present), and in such contexts as newspaper headlines, where it replaces the present perfect:

• In Hamlet, Ophelia drowns in a stream.
• 40-year-old wins gold medal.

Sometimes to refer to an arranged future event, usually with a reference to time:

• We leave for Berlin tomorrow at 1 pm.

In providing a commentary on events as they occur, or in describing some theoretical sequence of events:

• I chop the chives and add them to the mixture.
• According to the manager's new idea, I welcome the guests and you give the presentation.

In many dependent clauses referring to the future, particularly condition clauses, clauses expressing place and time, and many relative clauses (see below):

• If he finds your sweets, he will eat them.
• We will report as soon as we receive any information.

In certain situations in a temporal adverbial clause, rather than the present progressive:

• We can see the light improving as we speak.

In colloquial English it is common to use can see, can hear for the present tense of see, hear, etc., and have got for the present tense of have (denoting possession.

See have got and can see below.

For the present subjunctive, see subjunctive.

For uses of modal verbs (which may be regarded as instances of the simple present) see modal verbs.

Present progressive

The present progressive or present continuous form combines present tense with progressive aspect. It thus refers to an action or event conceived of as having limited duration, taking place at the present time. It consists of a form of the simple present of be together with the present participle of the main verb and the ending -ing.

• We are cooking dinner now.

This often contrasts with the simple present, which expresses repeated or habitual action (We cook dinner every day). However, sometimes the present continuous is used with always, generally to express annoyance about a habitual action:

• You are always making a mess in the study.

Certain stative verbs do not use the progressive aspect, so the present simple is used instead in those cases. The present progressive can be used to refer to a planned future event:

• We are tidying the attic tomorrow.

It also appears with future reference in many condition and time clauses and other dependent clauses:

• If he*'s sleeping* when you arrive, wake him up.
• I will finish the job while the children are playing.

It can also refer to something taking place not necessarily at the time of speaking, but at the time currently under consideration, in the case of a story or narrative being told in the present tense (as mentioned above under present simple):

• The king and queen are conversing when Hamlet enters. For the possibility of a present subjunctive progressive, see English subjunctive.

Present Perfect

The present perfect (traditionally called simply the perfect) combines present tense with perfect aspect, denoting the present state of an action's being completed, that is, that the action took place before the present time. (It is thus often close in meaning to the simple past tense, although the two are not usually interchangeable.) It is formed with the present tense of the auxiliary have (namely have or has) and the past participle of the main verb.

The choice of present perfect or past tense depends on the frame of reference (period or point in time) in which the event is conceived as occurring. If the frame of reference extends to the present time, the present perfect is used. For example:

• I have written a letter this morning. (if it is still the morning)
• He has produced ten plays. (if he is still alive and professionally active)
• They have never traveled abroad. (if they are still alive and considered capable of traveling)

If the frame of reference is a time in the past, or a period that ended in the past, the past tense is used instead. For example:

• I wrote a letter this morning (it is now afternoon);
• He produced ten plays (he is now dead or his career is considered over, or a particular past time period is being referred to);
• They never traveled abroad (similarly).

See Simple past for more examples.

The simple past is generally used when the occurrence has a specific past time frame – either explicitly stated (*I wrote a book in 1995; *the water boiled a minute ago), or implied by the context (for example, in the narration of a sequence of events). It is therefore normally incorrect to write a sentence like I have written a novel yesterday; the present perfect cannot be used with an expression of past time such as yesterday.

With already or yet, traditional usage calls for the present perfect: ''Have you eaten yet? Yes, I've already eaten.* However, current informal American speech tends to use the simple past: *Did you eat yet? Yes, I ate already.''

Use of the present perfect often draws attention to the present consequences of the past action or event, as opposed to its actual occurrence. The sentence she has come probably means she is here now, while the simple past she came does not. The sentence, "Have you been to the fair?" suggests that the fair is still going on, while the sentence, "Did you go to the fair?" could mean that the fair is over. (See also been and gone below.) Some more examples:

• I have eaten. (implies that I'm no longer hungry)
• We have made the dinner. (implies that the dinner is now ready to eat)
• The weather has gotten cloudier. (implies that it is now more cloudy than previously)

It may also refer to an ongoing state or habitual action, particularly in saying for how long, or since when, something is the case. For example:

• I have lived in Paris for five years.
• He has held the record since he won his Olympic gold.
• We have eaten breakfast together every morning since our honeymoon.

This implies that I still live in Paris, that he still holds the record and that we still eat together every morning (although the first sentence may also refer to some unspecified past period of five years).

When the circumstance is temporary, the present perfect progressive is often appropriate in such sentences (see below); however, if the verb is one that does not use the progressive aspect, the basic present perfect is used in that case too:

• Amy has been on the swing for ten minutes.

The present perfect may refer to a habitual circumstance, or a circumstance being part of a theoretical or story narrative being given in the present tense (provided the circumstance is of an event's having taken place previously):

• Whenever I get home, John has usually already arrived.
• According to the plan, the speeches have already been given when the cake is brought out.

The present perfect may also be used with future reference, instead of the future perfect, in those dependent clauses where future occurrence is denoted by present tense. For example:

• When you have written it, show it to me.

Present Perfect Progressive

The present perfect progressive (or present perfect continuous) construction combines some of this perfect progressive aspect with present tense.

It is formed with the present tense of have (have or has), the past participle of be (been), and the present participle of the main verb and the ending "-ing"

This construction is used for ongoing action in the past that continues right up to the present or has recently finished:

• I have been writing this paper all morning.
• Why are his eyes red? He has been crying.

It is frequently used when stating for how long, or since when, something is the case:

• She has been working here since 1997.
• How long have you been sitting there?
• They have been arguing about it for two weeks.

In these sentences the actions are still continuing, but it is the past portion of them that is being considered, and so the perfect aspect is used. (A sentence without perfect aspect, such as I am sitting here for three hours, implies an intention to perform the action for that length of time.)

With stative verbs that are not used in the progressive, and for situations that are considered permanent, the present perfect (nonprogressive) is used instead.

Sentence

A simple sentence consists of only one clause.
A compound sentence consists of two or more independent clauses.
A complex sentence has at least one independent clause plus at least one dependent clause.
A set of words with no independent clause may be an incomplete sentence, also called a sentence fragment.
A sentence consisting of at least one dependent clause and at least two independent clauses may be called a complex-compound sentence or compound-complex sentence.

1. I like trains.
2. I don't know how to bake, so I buy my bread already made.
3. I enjoyed the apple pie that you bought for me.
4. The dog lived in the garden, but the cat, who was smarter, lived inside the house.
5. What an idiot.

Sentence 1 is an example of a simple sentence.
Sentence 2 is compound because "so" is considereda coordinating conjunction in English, and sentence 3 is complex.
Sentence 4 is compound-complex (also known as complex-compound). Example 5 is a sentence fragment.

The simple sentence in example 1 contains one clause.
Example 2 has two clauses (I don't know how to bake and I buy my bread already made), combined into a single sentence with the coordinating conjunction so.
In example 3, I enjoyed the apple pie is an independent clause, and that you bought for me is a dependent clause; the sentence is thus complex.
In sentence 4, The dog lived in the garden and the cat lived inside the house are both independent clauses; who was smarter is a dependent clause.
Example 5 features a noun phrase but no verb. It is not a grammatically complete clause.

Verb

A verb is a word that expresses an action, a state, or an occurrence — and it's the engine of every English sentence. Understanding how verbs work is foundational to everything else in English grammar, from forming questions to building complex sentences.

Verb Forms

Most English verbs have five inflected forms:

• Base form (go, write, climb) — used as an infinitive, imperative, present subjunctive, and present indicative in all persons except third-person singular.
• -s form (goes, writes, climbs) — used for the present tense, third-person singular (she writes).
• Past tense (went, wrote, climbed) — also called the preterite.
• Past participle (gone, written, climbed) — identical to the past tense for regular verbs, but often different for irregular verbs.
• -ing form (going, writing, climbing) — serves as the present participle and gerund.

The verb be is a special case with more forms than any other English verb (am, is, are, was, were, been, being). Modal verbs like can, must, and should have fewer forms than typical verbs.

Main Verbs and Auxiliaries

Verbs in English often appear in combinations: one or more auxiliary verbs paired with a main verb.

• The dog was barking very loudly.
• My hat has been cleaned.
• Jane does not really like us.

The first verb in the combination is the finite verb (it carries tense and agrees with the subject). The rest are nonfinite (infinitives or participles). Notice that these verbs don't always sit next to each other — as in does not really like.

Tense, Aspect, and Mood

English expresses tense (time reference), aspect (how an action unfolds over time), and mood (the speaker's attitude toward the action) mostly through verb combinations rather than word endings. That's why you'll encounter labels like "present progressive" or "conditional perfect" — these are specific tense–aspect–mood combinations built with auxiliaries.

Self-check: If you can change the time of a sentence by swapping one word (She runs → She ran), that word is the verb.

Keep Practising

To build your verb skills from the ground up, try these challenges: Basics. "To be" in Present Tense, Basics. Common Uses of Auxiliary Verbs, and Transitive and Intransitive Verbs.

Active and Passive Voice

The active voice (where the verb's subject is understood to denote the doer, or agent), of the denoted action) is the unmarked voice in English.

To form the passive voice (where the subject denotes the undergoer, or patient), of the action), a periphrastic construction is used.

In the canonical form of the passive, a form of the auxiliary verb be (or sometimes get) is used, together with the past participle of the lexical verb. Passive voice can be expressed in combination together with tenses, aspects and moods, by means of appropriate marking of the auxiliary (which for this purpose is not a stative verb, i.e. it has progressive forms available).

For example:

• This room is tidied regularly. (simple present passive)
• It had already been accepted. (past perfect passive)
• Dinner is being cooked right now. (present progressive passive)

The passive forms of certain of the combinations involving the progressive aspect are quite rare; these include the present perfect progressive (it has been being written), past perfect progressive (it had been being written), future progressive (it will be being written), future perfect progressive (it will have been being written), conditional progressive (it would be being written) and conditional perfect progressive (it would have been being written). Because of the awkwardness of these constructions, they may be paraphrased, for example using the expression in the process of (it has been in the process of being written, it will be in the process of being written, and similar).

The uses of these various passive forms are analogous to those of the corresponding tense–aspect–mood combinations in the active voice.

Perfect

The perfect aspect is used to denote the circumstance of an action's being complete at a certain time. It is expressed using a form of the auxiliary verb have (appropriately conjugated for tense etc.) together with the past participle of the main verb: She has eaten it; We had left; When will you have finished?

Perfect forms can also be used to refer to states or habitual actions, even if not complete, if the focus is on the time period before the point of reference (We had lived there for five years). If such a circumstance is temporary, the perfect is often combined with progressive aspect.

The implications of the present perfect (that something occurred prior to the present moment) are similar to those of the simple past, although the two forms are generally not used interchangeably – the simple past is used when the time frame of reference is in the past, while the present perfect is used when it extends to the present.

For all uses of specific perfect constructions, see the sections on the present perfect, past perfect, future perfect and conditional perfect.

By using nonfinite forms of the auxiliary have, perfect aspect can also be marked on infinitives (as in should have left and expect to have finished working), and on participles and gerunds (as in having seen the doctor).

Note that while all of the constructions referred to here are commonly referred to as perfect (based on their grammatical form), some of them, particularly nonpresent and nonfinite instances, might not be considered truly expressive of the perfect aspect. This applies particularly when the perfect infinitive is used together with modal verbs: for example, he could not have been a genius might be considered (based on its meaning) to be a past tense of he cannot/could not be a genius; such forms are considered true perfect forms by some linguists but not others.

Perfect Progressive

The perfect and progressive (continuous) aspects can be combined, usually in referring to the completed portion of a continuing action or temporary state: I have been working for eight hours. Here a form of the verb have (denoting the perfect) is used together with been (the past participle of be, denoting the progressive) and the present participle of the main verb.

In the case of the stative verbs, which do not use progressive aspect, the plain perfect form is normally used in place of the perfect progressive: I've been here for half an hour (not I've been being here...).

Progressive

The progressive or continuous aspect is used to denote a temporary action or state that began at a previous time and continues into the present time (or other time of reference). It is expressed using a form of the auxiliary verb to be (conjugated appropriately for tense etc.) together with the present participle (-ing form) of the main verb: I am reading; Were you shouting?; He will be sitting over there.

Certain stative verbs make limited use of progressive aspect. Their nonprogressive forms (simple or nonprogressive perfect constructions) are used in many situations even when expressing a temporary state.

The main types are described below.

• The copular verb to be does not normally use progressive forms (I am happy, not I am being happy). However its progressive aspect is used in appropriate situations when the verb expresses the passive voice (We are being followed), and when it has the meaning of "behave" or "act as" (You are being very naughty; He's being a pest).
• The verb to have does not use progressive forms when it expresses possession), broadly understood (I have a brother, not I'm having a brother), but it does use them in its active meanings (I'm having a party; She's having a baby; He was having a problem starting his car). Other verbs expressing a state of possession or similar, such as possess, own, belong and owe, also do not normally use progressive forms.
• Verbs of mental state, sense perception and similar (know, believe, want, think, see, hear, need, etc.) are generally used without progressive aspect, although some of them can be used in the progressive to imply an ongoing, often temporary situation (I am feeling lonely), or an activity (I am thinking about a problem).
• Verbs denoting positional state normally do use the progressive if the state is temporary: He is standing in the corner. (Compare permanent state: London stands on the banks of the Thames.)

Perfect Progressive

The perfect and progressive (continuous) aspects can be combined, usually in referring to the completed portion of a continuing action or temporary state: I have been working for eight hours. Here a form of the verb have (denoting the perfect) is used together with been (the past participle of be, denoting the progressive) and the present participle of the main verb.

In the case of the stative verbs, which do not use progressive aspect, the plain perfect form is normally used in place of the perfect progressive: I've been here for half an hour (not I've been being here...).

Simple

"Simple" forms of verbs are those appearing in constructions not marked for either progressive or perfect aspect (I go, I don't go, I went, I will go, etc., but not I'm going or I have gone).

Simple constructions normally denote a single action (perfective aspect), as in Brutus killed Caesar, a repeated action (habitual aspect), as in I go to school, or a relatively permanent state, as in We live in Dallas. They may also denote a temporary state (imperfective aspect), in the case of stative verbs that do not use progressive forms.

B2 | Upper Intermediate

B2, or Upper Intermediate, is the fourth level on the CEFR scale. It marks the point where you move from "getting by" to genuinely comfortable communication — handling complex topics, expressing nuanced opinions, and understanding most of what you read or hear in real-world contexts.

What a B2 user can do

At this level, you're expected to:

• Understand complex texts on both concrete and abstract topics, including technical discussions in your own field.
• Follow extended speech and lectures, even when the structure isn't entirely clear, as long as the topic is reasonably familiar.
• Interact fluently and spontaneously enough that conversations with native speakers flow naturally — without strain on either side.
• Produce clear, detailed text on a wide range of subjects, using connectors and cohesive devices to build well-structured arguments.
• Explain and defend a viewpoint on a topical issue, weighing the advantages and disadvantages of different options.
• Recognize implicit meaning — reading between the lines in demanding, longer texts.

What B2 grammar looks like in practice

B2 is where grammar stops being about isolated rules and starts being about flexibility and precision. You're expected to control structures like:

• Advanced conditionals and mixed conditionals — moving beyond simple if-clauses to express hypothetical and counterfactual meaning.
• Passive voice in varied tenses and contexts, not just present and past simple.
• Reported speech with correct sequence of tenses, including backshifting and reporting verbs.
• Participle clauses and the distinction between participles and gerunds.
• Comparative and superlative structures beyond basic -er/-est, including double comparatives and qualifying expressions.

Errors still happen at B2, but they rarely cause misunderstanding. The goal is controlled, flexible use of language across social, academic, and professional settings.

How B2 fits in the CEFR progression

B2 builds directly on the foundations of B1 (Intermediate) and prepares you for C1 (Advanced). Many university entrance exams, professional certifications, and immigration requirements target B2 as the minimum standard.

Self-check: If you can read a newspaper editorial, follow most of a TED talk without subtitles, and write a clear essay arguing a position — you're likely operating at B2.

Ready to test yourself? Try Is your English level B2/Upper Intermediate? or practise specific B2 grammar with challenges like Basics. Advanced Conditionals And "wish", Basics. Passive Voice, and Sequence of Tenses in Indirect Speech.

Difficulty: Medium

Medium difficulty. Difficulty levels represent author's opinion about how hard a question or challenge is.