Verb Forms: Be/Have/Do and Regular/Irregular Verbs
Explanation and Examples
Verb forms are the different ways verbs change to show tense, voice, mood, or other grammatical features. In English, there are regular and irregular verbs.
- Regular verbs: These verbs follow a consistent pattern when changing forms, usually by adding -ed for past simple and past participle forms.
- Irregular verbs: These verbs have unique forms for past simple and past participle that do not follow the regular pattern.
The verbs "be," "have," and "do" are essential because they are used as auxiliary verbs and have irregular forms in the past tense.
Regular and Irregular Verb Forms
Regular verbs follow a pattern when forming their past simple and past participle forms, usually by adding -ed.
Example:
| Base Form | Past Simple | Past Participle |
|---|---|---|
| work | worked | worked |
Irregular verbs have unique forms for past simple and past participle that do not follow the regular pattern.
Examples:
| Base Form | Past Simple | Past Participle |
|---|---|---|
| be | was/were | been |
| have | had | had |
| do | did | done |
Common Irregular Verbs
Here is a table of some common irregular verbs with their past simple and past participle forms:
| Base Form | Past Simple | Past Participle |
|---|---|---|
| go | went | gone |
| write | wrote | written |
| sing | sang | sung |
| swim | swam | swum |
| bring | brought | brought |
| buy | bought | bought |
| catch | caught | caught |
| come | came | come |
Correct Answers
The original sentence requires the past perfect tense, which is formed using the auxiliary verb "had" followed by the past participle of the main verb. The verb "to write" is an irregular verb, and its past participle form is "written." So, the correct answer is "He had written a letter by the time we arrived."
The original sentence requires the past simple tense. For regular verbs, the simple past form is created by adding "-ed" to the base form of the verb. In this case, the base form is "work," and the past simple form is "worked." So, the correct answer is "she worked in her office."
The original sentence requires the past perfect tense, which is formed using the auxiliary verb "had" followed by the past participle of the main verb. For regular verbs, the past participle is the same as the simple past form, created by adding "-ed" to the base form.
The present passive voice is formed using the auxiliary verb "am," "is," or "are" followed by the past participle of the main verb. In this case, the subject is "dinner," which requires "is" as the auxiliary verb, and the past participle of "to cook" is "cooked." So, the correct answer is "is cooked."
The past continuous tense is formed using the auxiliary verb "was" or "were" followed by the present participle (-ing form) of the main verb. In this case, the subject is "she
The present continuous tense is formed using the auxiliary verb "am," "is," or "are" followed by the present participle (-ing form) of the main verb. In this case, the subject is "the children," which requires "are" as the auxiliary verb, and the present participle of "to swim" is "swimming." So, the correct answer is "are swimming."
The original sentence requires the past simple tense for the first blank and the present perfect tense for the second blank. The verb "to eat" is an irregular verb. Its simple past form is "ate," and its past participle form is "eaten." So, the correct answer is "They ate dinner last night, but they have eaten breakfast yet today."
The past passive voice is formed using the auxiliary verb "was" or "were" followed by the past participle of the main verb. In this case, the subject is "the house," which requires "was" as the auxiliary verb, and the past participle of "to clean" is "cleaned." So, the correct answer is "was cleaned."
The present perfect tense is formed using the auxiliary verb "have" or "has" followed by the past participle of the main verb. In this case, the subject is "they," which requires "have" as the auxiliary verb, and the past participle of "to visit" is "visited." So, the correct answer is "have visited."
Choose the correct question form for the following sentence.
"They went to the movies last night."
Answers:
The original sentence is in the past simple tense. To form a question in the past simple tense, use the auxiliary verb "did" followed by the subject and the base form of the verb. In this case, the subject is "they," and the base form of "to go" is "go." So, the correct question form is "Did they go to the movies last night?"
The original sentence requires the past simple tense. The verb "to read" is an irregular verb, and its simple past form is the same as the base form, which is "read." So, the correct answer is "She read a book last night."
Choose the correct negative form for the following sentence.
"He plays basketball every weekend."
Answers:
The original sentence is in the present simple tense. To form a negative sentence in the present simple tense, use the auxiliary verb "do" or "does" followed by "not" (contracted to "doesn't" for third person singular) and the base form of the verb. In this case, the correct answer is "He doesn't play basketball every weekend."
Present tense
- I work here. — simple present (habit/permanent)
- I am working now. — present progressive (happening right now)
- I have lived here for 10 years. — present perfect (started past, still true)
- I have been waiting for an hour. — present perfect progressive (duration up to now)
Four present tense forms: simple (habits/facts), progressive (now/temporary), perfect (past → present relevance), perfect progressive (ongoing duration). Each encodes a different relationship between the action and the present moment.
Trap: "I am living here for 10 years" ❌ — started in the past + still true = present PERFECT (have lived/have been living), not progressive.
Simple tense
- ✅ I go to work every day. — present simple (habit)
- ✅ She went home yesterday. — past simple (completed action)
- ✅ I will call you later. — future simple (promise/decision)
- ✅ Water boils at 100°C. — present simple (general truth)
The simple aspect is the default, unmarked verb form. Present simple = habits, facts, schedules. Past simple = completed actions. Future simple = predictions, promises, decisions. No auxiliary needed (except will for future and do for questions/negatives).
Rule: if the action is a fact, habit, completed event, or scheduled future — and you don't need to emphasise it being in-progress or connected to now → simple tense.
Perfect tense
- ✅ I have lived here for ten years. — present perfect (started past, still true)
- ❌ I live here for ten years. — wrong (simple present can't bridge past→now)
- ✅ She had finished before I arrived. — past perfect (earlier past)
- ✅ They will have left by noon. — future perfect (completed before future point)
The perfect = have + past participle. Connects an action to a reference point in time. Present perfect bridges past→now. Past perfect marks "earlier past." Future perfect marks "done before a future deadline."
Rule: if the action started in the past and is still relevant now → present perfect (have done). If two past events and you need the earlier one → past perfect (had done).
Passive voice
- ✅ The meal was cooked by the chef. — passive (action matters)
- ✅ Mistakes were made. — passive, agent hidden (evasive)
- ✅ Active: The chef cooked the meal. — stronger, clearer
- ❌ The report was being been written. — malformed passive
The passive = be + past participle. Object becomes subject. Use it when the doer is unknown, irrelevant, or obvious. Avoid when it hides responsibility or weakens prose.
Formula: find the active object → make it the subject → use be (matching tense) + past participle → optionally add by + agent.
Participle
- ✅ a broken window — past participle as adjective
- ✅ the running water — present participle as adjective
- ✅ I have eaten. — past participle in perfect tense
- ✅ She is sleeping. — present participle in progressive tense
- ❌ I have went. — wrong (past tense, not past participle: use gone)
A participle is a verb form that also works as an adjective. Present (-ing): running, sleeping. Past (-ed or irregular): broken, written, gone. Used in progressive tenses, perfect tenses, passive voice, and as modifiers.
Trap: don't confuse past tense (went) with past participle (gone). After have/has/had → always past participle.
Irregular verb
- ✅ go → went → gone — ❌ goed / goed
- ✅ eat → ate → eaten — ❌ eated / eated
- ✅ put → put → put — all three forms identical
- ✅ cut → cut → cut — no change group
Irregular verbs don't add -ed for past tense — they change form unpredictably. About 200 common English verbs are irregular, and they include the most frequently used verbs (be, have, go, do, say, make, take).
Pattern: no rule covers all of them. Some rhyme (sing/sang/sung, ring/rang/rung), some don't change (put/put/put), some are unique (go/went/gone). Memorisation is the only path.
Finite verb
- ✅ She goes to work. — finite (marked for tense + agrees with subject)
- Going to work — non-finite (gerund, no tense marking)
- To go to work — non-finite (infinitive)
- ❌ She going to work. — missing finite verb (fragment)
A finite verb carries tense and agrees with its subject. Non-finite forms (infinitives, gerunds, participles) don't. Every complete clause requires at least one finite verb.
Test: can you change the tense? Goes → went → finite. Going → ??? → non-finite. If your sentence has no finite verb, it's a fragment.
Morphology
- un- + believe + -able = unbelievable (prefix + root + suffix)
- re- + write = rewrite (prefix changes meaning: "again")
- kind + -ness = kindness (suffix changes word class: adjective → noun)
- mis- + interpret + -ation = misinterpretation (3 morphemes)
Morphology = how words are built from parts: roots (core meaning), prefixes (before: un-, re-, mis-, pre-), suffixes (after: -tion, -able, -ly, -ness). Knowing common affixes lets you decode unfamiliar words.
Pattern: prefixes usually change meaning (happy → unhappy). Suffixes usually change word class (happy → happiness, adjective → noun).
English Grammar Basics
- She is a teacher. — verb be + noun complement
- He runs every day. — present simple, third-person -s
- They don't like coffee. — negation with do-support
- I have two cats. — possession, countable noun, no article before plurals
These sentences demonstrate English Grammar Basics — the foundational patterns every other topic builds on: parts of speech, basic tenses, articles, and simple sentence structure.
If you can identify the verb, the subject, and count the noun correctly, you've nailed the basics that make everything else click.
A1 | Elementary | Beginners
- ✅ My name is Anna. — present simple of be
- ✅ Where is the station? — basic *wh-*question
- ✅ I have two brothers. — possession with have
- ✅ She likes coffee. — third-person -s
These are A1 sentences — the starting level of the CEFR framework. At A1 you can introduce yourself, ask and answer simple personal questions, and handle basic everyday transactions using present tense, be/have/do, and core vocabulary.
If you can say these but freeze at normal speaking speed, you're solidly A1 — and that's exactly where to start.
A2 | Elementary | Pre-intermediate
- ✅ I went to the cinema yesterday. — past simple
- ✅ I have visited Paris twice. — present perfect (life experience)
- ✅ If it rains, I'll take an umbrella. — first conditional
- ✅ You should see a doctor. — modal for advice
These patterns are A2 — the second CEFR level. At A2 you move past survival phrases into real grammar: past tenses, the present perfect, basic conditionals, and modals for advice/obligation.
Marker: if you can describe yesterday and give simple advice, but struggle with abstractions or nuance, you're at A2.
B1 | Intermediate
- ✅ If I had more time, I would travel more. — second conditional
- ✅ The bridge was built in 1920. — passive voice
- ✅ She said she was tired. — reported speech with backshift
- ✅ Although it rained, we enjoyed the trip. — complex sentence with concession
These are B1 patterns — the CEFR intermediate level. At B1 you link ideas, use passive voice, handle reported speech, and manage second conditional — enough for travel, work basics, and everyday independence.
Marker: if you can explain why something happened and follow a news story, you're B1.
Easy
- She is a teacher. — one verb form, one rule
- I have two cats. — basic possession, short sentence
- He doesn't like coffee. — simple negation with do-support
- Only one answer is clearly correct; distractors are obviously wrong.
Easy marks beginner-level challenges: A1–early A2, one rule at a time, everyday vocabulary, no trick questions.
Use "Easy" when you want to build confidence on a specific rule without interference from other grammar or tricky contexts.