Adjective and Adverb

English distinguishes between adjectives, which qualify nouns and pronouns, and adverbs, which mainly modify verbs, adjectives, or other adverbs. Not all languages make this exact distinction; many (including English) have words that can function as either. For example, in English, fast is an adjective in "a fast car" (where it qualifies the noun car) but an adverb in "he drove fast" (where it modifies the verb drove).

Adjective

An adjective is word whose main syntactic role is to modify a noun or noun phrase. Its semantic role is to change information given by the noun.

Adjectives are one of the main parts of speech of the English language, although historically they were classed together with nouns. Certain words that were traditionally considered to be adjectives, including the, this, my, etc., are today usually classed separately, as determiners.

Adverb

An adverb is a word that modifies a verb, adjective, determiner, clause, preposition, or sentence. Adverbs typically express manner, place, time, frequency, degree, level of certainty, etc., answering questions such as how?, in what way?, when?, where?, and to what extent?. This function is called the adverbial function, and may be realized by single words (adverbs) or by multi-word expressions (adverbial phrases and adverbial clauses).

Adverbs are traditionally regarded as one of the parts of speech. However, modern linguists note that the term "adverb" has come to be used as a kind of "catch-all" category, used to classify words with various different types of syntactic behavior, not necessarily having much in common except that they do not fit into any of the other available categories (noun, adjective, preposition, etc.)

Preposition

Prepositions form a closed word class, although there are also certain phrases that serve as prepositions, such as in front of.

A single preposition may have a variety of meanings, often including temporal, spatial and abstract. Many words that are prepositions can also serve as adverbs. Examples of common English prepositions (including phrasal instances) are of, in, on, over, under, to, from, with, in front of, behind, opposite, by, before, after, during, through, in spite of or despite, between, among, etc.

A preposition is usually used with a noun phrase as its complement.

A preposition together with its complement is called a prepositional phrase.

Examples are in England, under the table, after six pleasant weeks, between the land and the sea.

A prepositional phrase can be used as a complement or post-modifier of a noun in a noun phrase, as in the man in the car, the start of the fight; as a complement of a verb or adjective, as in deal with the problem, proud of oneself; or generally as an adverb phrase.

English allows the use of "stranded" prepositions. This can occur in interrogative and relative clauses, where the interrogative or relative pronoun that is the preposition's complement is moved to the start (fronted), leaving the preposition in place. This kind of structure is avoided in some kinds of formal English.

For example:

• What are you talking about? (Possible alternative version: About what are you talking?)
• The song that you were listening to ... (more formal: The song to which you were listening ...)

Notice that in the second example the relative pronoun that could be omitted.

Stranded prepositions can also arise in passive voice constructions and other uses of passive past participial phrases, where the complement in a prepositional phrase can become zero in the same way that a verb's direct object would: it was looked at; I will be operated on; get your teeth seen to.

The same can happen in certain uses of infinitive phrases: he is nice to talk to; this is the page to make copies of.

Determinative

An important role in English grammar is played by determiners – words or phrases that precede a noun or noun phrase and serve to express its reference in the context. Determinative is a lexical category whereas determiner is a grammatical or syntactic function. In traditional grammar, determinatives form a subclass of adjectives. In the Cambridge Grammar of English Language, determinatives are considered to be a distinct primary lexical category (part of speech). Just as the determiner function is not always realised by determinatives, so many of determinatives can have other functions that that of determiner. The determinative three is determiner is three books, but modifier in these three books. Similarly, determinative much is determiner in much happiness but a modifier in much happier.

Article

Articles in the English language are the definite article the and the indefinite articles a and an. Use of the definite article implies that the speaker assumes the listener knows the identity of the noun's referent (because it is obvious, because it is common knowledge, or because it was mentioned in the same sentence or an earlier sentence). Use of an indefinite article implies that the speaker assumes the listener does not have to be told the identity of the referent. In some noun phrases, no article is used.

Zero Article

The term zero article refers to noun phrases that contain no articles, definite or indefinite. English, like many other languages, does not require an article in plural noun phrases with a generic reference, a reference to a general class of things. English also uses no article before a mass noun or a plural noun if the reference is indefinite, a thing that is not specifically identifiable in context.

For example:

• Generic mass noun: Happiness is contagious.
• Generic plural noun: Cars have accelerators.
• Generic plural noun: They want equal rights.
• Indefinite mass noun: I drink coffee.
• Indefinite plural noun: I saw cars.

In English, the zero article rather than the indefinite article is often used with plurals and mass nouns (although the word "some" can function like an indefinite plural article).

The definite article is sometimes omitted before some words for specific institutions, such as prison, school, and (in standard non-American dialects) hospital.

• She is in hospice.
• The criminal went to prison.
• I'm going to school.

The article may also be omitted between a preposition and the word bed when describing activities typically associated with beds.

• He is lying in bed.
• They went to bed.

Where a particular location is meant, or when describing activities that are not typical, the definite article is used.

• She was dismissed from the hospital.
• The plumber went to the prison to fix the pipes.
• We were jumping on the bed.

The zero article is also used in instructions and manuals. In such cases, the references in the text are all definite, and thus no distinction between definite and indefinite has to be made.

• Grasp drumstick.
• Place knife between thigh and body; cut through skin to joint. Separate thigh and drumstick at joint.

The zero article is used with meals.

• I have just finished dinner.
• Breakfast is the most important meal of the day.

The zero article is used when describing calendar years.

• I was born in 1978.

The zero article is used before titles

• The Board appointed him Captain.

Possessives

In English, possessive words or phrases exist for nouns and most pronouns, as well as some noun phrases. These can play the roles of determiners (also called possessive adjectives when corresponding to a pronoun) or of nouns.

For historical reasons, this case is misleadingly called the possessive (case). It was called the genitive until the 18th century and in fact expresses much more than possession. Most disagreements about the use of possessive forms of nouns and of the apostrophe are due to the erroneous belief that a term should not use an apostrophe if it does not express possession.

In the words of the Merriam-Webster Dictionary of English Usage:

The argument is a case of fooling oneself with one's own terminology. After the 18th-century grammarians began to refer to the genitive case as the possessive case, grammarians and other commentators got it into their heads that the only use of the case was to show possession. ...

This dictionary also cites a study in whose samples only 40% of the possessive forms were used to indicate actual possession.

Nouns, noun phrases, and some pronouns generally form a possessive with the suffix -'s (apostrophe plus s, but in some cases just by adding an apostrophe to an existing s). Personal pronouns, however, have irregular possessives, and most of them have different forms for possessive determiners and possessive pronouns, such as my and mine or your and yours.

Possessives are one of the means by which genitive constructions are formed in modern English, the other principal one being the use of the preposition of.

Indicative

Indicative mood, in English, refers to finite verb forms that are not marked as subjunctive and are not imperatives or conditionals. They are the verbs typically found in the main clauses of declarative sentences and questions formed from them, as well as in most dependent clauses (except for those that use the subjunctive). The information that a form is indicative is often omitted when referring to it: the simple present indicative is usually referred to as just the simple present, etc. (unless some contrast of moods, such as between indicative and subjunctive, is pertinent to the topic).

Subjunctive

Certain types of clause, mostly dependent clauses, use a verb form identified with the subjunctive mood. The present subjunctive takes a form identical to the bare infinitive, as in It is necessary that he be restrained. There is also a past subjunctive, distinct from the indicative only in the possible use of were in place of was in certain situations: If I were you, ...

Imperative

An independent clause in the imperative mood uses the base form of the verb, usually with no subject (although the subject you can be added for emphasis).

Negation uses do-support (i.e. do not or don't). For example:

• Now eat your dinner.
• You go and stand over there!
• Don't ever say that word again.

Sentences of this type are used to give an instruction or order. When they are used to make requests, the word please (or other linguistic device) is often added for politeness:

• Please pass the salt.

First person imperatives (cohortatives) can be formed with let us (usually contracted to let's), as in "Let's go". Third person imperatives (jussives) are sometimes formed similarly, with let, as in "Let him be released".

Conditional

The status of the conditional mood in English is similar to that of the future tense: it may be considered to exist provided the category of mood is not required to be marked morphologically). The English conditional is expressed periphrastically with verb forms governed by the auxiliary verb would. The modal verb could is also sometimes used as a conditional (of can).

In certain uses, the conditional construction with would/should may also be described as "future-in-the-past".

Imperative Sentence / Clause

An imperative sentence gives anything from a command or order, to a request, direction, or instruction. Imperative sentences are more intentional than exclamatory sentences and do require an audience; as their aim is to get the person(s) being addressed either to do or to not do something. And although this function usually deals with the immediate temporal vicinity, its scope can be extended, i.e. you can order somebody to move out as soon as you find yourself a job. The negative imperative can also be called the prohibitive and the inclusive plural imperative, the hortative. It is debatable whether the imperative is only truly possible in the second person. The vocative case of nouns can be said to indicate the imperative as well since it does not seek information, but rather a reaction from the one being addressed. An imperative can end in either a period or an exclamation point depending on delivery.

• Look at me.
• After separating them from the yolks, beat the whites until they are light and fluffy.

Adverb

An adverb is a word that modifies a verb, adjective, determiner, clause, preposition, or sentence. Adverbs typically express manner, place, time, frequency, degree, level of certainty, etc., answering questions such as how?, in what way?, when?, where?, and to what extent?. This function is called the adverbial function, and may be realized by single words (adverbs) or by multi-word expressions (adverbial phrases and adverbial clauses).

Adverbs are traditionally regarded as one of the parts of speech. However, modern linguists note that the term "adverb" has come to be used as a kind of "catch-all" category, used to classify words with various different types of syntactic behavior, not necessarily having much in common except that they do not fit into any of the other available categories (noun, adjective, preposition, etc.)

Adjective

In linguistics, an adjective is a describing word, the main syntactic role of which is to qualify a noun or noun phrase, giving more information about the object signified.

Adjectives are one of the English parts of speech, although they were historically classed together with the nouns. Certain words that were traditionally considered to be adjectives, including the, this, my, etc., are today usually classed separately, as determiners.

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.

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 Future

The term simple future, future simple or future indefinite, as applied to English, generally refers to the combination of the modal auxiliary verb will with the bare infinitive of the main verb.

Sometimes (particularly in more formal or old-fashioned English) shall is preferred to will when the subject is first person (I or we).

The auxiliary is often contracted to 'll.

This construction can be used to indicate what the speaker views as facts about the future, including confident predictions:

• The sun will rise tomorrow at 6:14.
• It will rain later this week.

It may be used to describe future circumstances that are subject to some condition:

• He will go there if he can.

However English also has other ways of referring to future circumstances. For planned or scheduled actions the present progressive or simple present may be used. There is also a going-to future, common in colloquial English, which is often used to express intentions or predictions (I am going to write a book some day; I think that it is going to rain). Use of the will/shall construction when expressing intention often indicates a spontaneous decision:

• I know! I'll use this book as a door stop.

Compare I'm going to use..., which implies that the intention to do so has existed for some time.

Use of present tense rather than future constructions in condition clauses and certain other dependent clauses is described below under and. The modal verbs will and shall also have other uses besides indicating future time reference. For example:

• I will pass this exam. (often expresses determination in addition to futurity)
• You will obey me! (insistence)
• I will not do it! (negative insistence, refusal)
• At this moment I will tolerate no dissent. (strong volition)
• He hasn't eaten all day; he will be hungry now. (confident speculation about the present)
• One of his faults is that he will make trouble unnecessarily. (habit)
• Shall we get to work? (suggestion)

Future Progressive

The future progressive or future continuous combines progressive aspect with future time reference; it is formed with the auxiliary will (or shall in the first person, the bare infinitive be, and the present participle of the main verb.

It is used mainly to indicate that an event will be in progress at a particular point in the future:

• This time tomorrow I will be taking my driving test.
• I imagine we will already be eating when you arrive.

The usual restrictions apply, on the use both of the future and of the progressive: simple rather than progressive aspect is used with some stative verbs, and present rather than future constructions are used in many dependent clauses. The same construction may occur when will or shall is given one of its other uses, for example:

• He will be sitting in his study at this time. (confident speculation about the present)

Future Perfect

The future perfect combines aspect with future time reference.

It consists of the auxiliary will (or sometimes shall in the first person, as above), the bare infinitive have, and the past participle of the main verb.

It indicates an action that is to be completed sometime prior to a future time of perspective, or an ongoing action continuing up to a future time of perspective (compare uses of the present perfect above).

• I shall have finished my essay by Thursday.
• When I finally search him he will have disposed of the evidence.
• By next year we will have lived in this house for half a century.

For the use of the present tense rather than future constructions in certain dependent clauses.

The same construction may occur when will or shall is given one of its other meanings; for example:

• He will have had his tea by now. (confident speculation about the present)
• You will have completed this task by the time I return, is that understood? (giving instruction)

Future Perfect Progressive

The future perfect progressive or future perfect continuous combines perfect progressive aspect with future time reference.

It is formed by combining the auxiliary will (or sometimes shall, as above), the bare infinitive have, the past participle been, and the present participle of the main verb.

Uses of the future perfect progressive are analogous to those of the present perfect progressive, except that the point of reference is in the future. For example:

• He will be very tired because he will have been working all morning.
• By 6 o'clock we will have been drinking for ten hours.

For the use of present tense in place of future constructions in certain dependent clauses.

The same construction may occur when the auxiliary (usually will) has one of its other meanings, particularly expressing a confident assumption about the present:

• No chance of finding him sober now; he'll have been drinking all day.

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.

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...).

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!

Modal Verb

English has the modal verbs can, could, may, might, must, shall, should, will, would, and also (depending on classification adopted) ought (to), dare, need, had (better), used (to). These do not add -s for the third-person singular, and they do not form infinitives or participles; the only inflection they undergo is that to a certain extent could, might, should and would function as preterites (past tenses) of can, may, shall and will respectively.

A modal verb can serve as the finite verb introducing a verb catena, as in "he might have been injured then". These generally express some form of modality (possibility, obligation, etc.), although will and would (and sometimes shall and should) can serve – among their other uses – to express future time reference and conditional mood.

Compound Sentence

A compound sentence is composed of at least two independent clauses. It does not require a dependent clause.

The clauses are joined by a coordinating conjunction (with or without a comma), a semicolon that functions as a conjunction, a colon instead of a semicolon between two sentences when the second sentence explains or illustrates the first sentence and no coordinating conjunction is being used to connect the sentences, or a conjunctive adverb preceded by a semicolon.

A conjunction can be used to make a compound sentence. Conjunctions are words such as for, and, nor, but, or, yet, and so.

Examples:

• I started on time, but I arrived late.
• I will accept your offer or decline it; these are the two options.
• The law was passed: from April 1, all cars would have to be tested.
• The war was lost; consequently, the whole country was occupied.

The use of a comma to separate two independent clauses without the addition of an appropriate conjunction is called a comma splice and is generally considered an error (when used in the English language).

Example:

• The sun was shining, everyone appeared happy.

Questions

Like many other Western European languages, English historically allowed questions to be formed by inverting the positions of verb and subject. Modern English permits this only in the case of a small class of verbs ("special verbs"), consisting of auxiliaries as well as forms of the copula be. To form a question from a sentence which does not have such an auxiliary or copula present, the auxiliary verb do (does, did) needs to be inserted, along with inversion of the word order, to form a question. For example:

• She can dance. → Can she dance? (inversion of subject she and auxiliary can)
• I am sitting here. → Am I sitting here? (inversion of subject I and copula am)
• The milk goes in the fridge. → Does the milk go in the fridge? (no special verb present; do-support required)

The above concerns yes-no questions, but inversion also takes place in the same way after other questions, formed with interrogative words such as where, what, how, etc. An exception applies when the interrogative word is the subject or part of the subject, in which case there is no inversion. For example:

• I go. → Where do I go? (wh-question formed using inversion, with do-support required in this case)
• He goes. → Who goes? (no inversion, because the question word who is the subject)

Note that inversion does not apply in indirect questions: I wonder where he is (not ... where is he). Indirect yes-no questions can be expressed using if or whether as the interrogative word: Ask them whether/if they saw him*.

Negative questions are formed similarly; however if the verb undergoing inversion has a contraction with not, then it is possible to invert the subject with this contraction as a whole. For example:

• John is going. (affirmative)
• John is not going. / John isn't going. (negative, with and without contraction)
• Isn't John going? / Is John not going? (negative question, with and without contraction respectively)

Tag questions are formed with a special verb and pronoun subject: isn't it?; were there?; am I not?

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.

A2 / Elementary / Pre-intermediate

A CEFR A2 level English language user is considered to be at an elementary level. At this level, an individual is expected to have a basic understanding of the English language and be able to use simple phrases and sentences to communicate in everyday situations. They should be able to understand and use basic grammar and vocabulary, and be able to understand short, simple texts.

At A2 level, They can understand sentences and frequently used expressions related to areas of most immediate relevance (e.g. very basic personal and family information, shopping, local geography, employment). They can communicate in simple and routine tasks requiring a simple and direct exchange of information on familiar and routine matters. They can describe in simple terms aspects of their background, immediate environment and matters in areas of immediate need. They can also interact with a degree of fluency and spontaneity that makes regular interaction with native speakers quite possible without strain for either party.

A2 | Elementary | Pre-intermediate.

Difficulty: Easy

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