Basics. Verb Forms: Be/Have/Do and Regular/Irregular Verbs.
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 |
Present tense
The present tense in English has four forms: simple present (I work) for habits, general truths, and stative descriptions; present progressive (I am working) for actions happening right now or temporary situations; present perfect (I have worked) for past actions with present relevance; and present perfect progressive (I have been working) for ongoing actions continuing into the present.
The simple/progressive distinction is one of the trickiest jumps for learners — I work in Paris (habitual) and I'm working in Paris (temporary, right now) feel almost identical but signal different things. Pick wrong and your meaning subtly shifts.
Simple tense
The simple aspect is the unmarked verb form — no progressive -ing, no have + past participle. I go, I went, I will go are simple; I am going, I have gone, I had gone are not. The simple aspect typically marks a single completed action (Brutus killed Caesar), a repeated/habitual action (I go to school every day), or a permanent state (We live in Dallas).
The simple aspect is the foundation everything else builds on. Once it's automatic, switching into progressive (ongoing) or perfect (completed-relative-to-now) becomes a small adjustment rather than a fresh decision.
Perfect tense
The perfect aspect marks an action as complete relative to a point in time. It's formed with have + past participle: I have eaten (present perfect), She had finished (past perfect), They will have arrived (future perfect). The perfect doesn't just say when — it says the action's completion is relevant to the time of reference.
The trickiest English-specific use is the present perfect: I have lived in Paris connects the past to now (you may still live there), while I lived in Paris doesn't. This connection is one of the biggest jumps for learners whose native language doesn't make the same distinction.
Passive voice
The passive voice flips a sentence so the object of the action becomes the subject, and the original doer either disappears or moves to a by-phrase: The chef cooked the meal (active) → The meal was cooked by the chef (passive). Formed with be + past participle (was cooked, is being written, had been seen), and works across all tenses.
Use the passive when the action matters more than the doer (The report was filed), when the doer is unknown or obvious (My car was stolen), or to soften criticism (Mistakes were made). Overusing it makes prose feel evasive — careful writers reach for the active voice by default.
Participle
A participle is a verb form that doubles as an adjective or adverb. English has two: the present participle ending in -ing (running, sitting) and the past participle (broken, gone, written). Both build tenses (is running, has gone), but they also stand alone modifying nouns (the broken window) or verbs (Exhausted, we fell asleep).
Participles look like simple parts of speech but pull double duty — most learner errors come from confusing the present participle with the gerund (also -ing but acting as a noun) or the past participle with the past tense.
Irregular verb
An irregular verb doesn't form its past tense and past participle by adding -ed — it changes shape in unpredictable ways: go → went → gone, eat → ate → eaten, put → put → put, take → took → taken. English has roughly 200 irregular verbs in common use, and many of them are the most frequently used verbs in the language (be, have, do, say, get, make, go, come).
Because the most-used verbs are irregular, you can't avoid them — they show up in every sentence. Memorising the three principal parts (base, past tense, past participle) of the top 100 is one of the highest-leverage moves at A2/B1.
Finite verb
A finite verb is a verb form that's marked for tense and (usually) agrees with its subject in person and number — go, goes, went, am, is, was, can, will. Non-finite forms (the infinitive to go, the gerund going, the past participle gone) carry no tense and don't agree with a subject.
Every full English clause needs exactly one finite verb at its core. Spotting which verb in a chain is the finite one (She will have been working → finite is will) is the foundation for understanding tense, agreement, and clause structure.
Morphology
Morphology is the study of how words are built — their internal structure, the parts they're made of (roots, stems, prefixes, suffixes), and how those parts combine to create related words. Happy → happiness → unhappy → unhappiness: same root, different morphology, different meanings.
For learners, morphology is what lets you guess the meaning of a new word from its pieces (pre- + judge = prejudge; -able added to read = readable). It also explains why English plurals, past tenses, and comparatives behave the way they do.
English Grammar Basics
The English Grammar Basics tag marks quizzes and explainers covering the foundations of English grammar — nouns, verbs, adjectives, adverbs, prepositions, conjunctions, tenses, voice, mood, and basic sentence structure.
If you're starting out or rebuilding from scratch, this is the tag to follow: every challenge under it is designed to land the core rules without burying you in exceptions. Get the basics solid here and the more advanced topics — conditionals, reported speech, inversion — stop looking like a wall of new rules and start looking like extensions of what you already know.
A1 | Elementary | Beginners
A1 is the starting level of the CEFR framework — the entry point into English. At A1 you can introduce yourself, ask and answer simple personal questions, recognise common signs and instructions, and have short slow-paced conversations on very familiar topics.
Grammatically, A1 covers the building blocks: present-tense forms of be, have, and do; basic word order; simple questions; and the most common determiners, pronouns, and prepositions. Knowing your level matters — A1 material teaches the foundations every later level builds on, while a B1 textbook will overwhelm you. Start here and progress is fast.
A2 | Elementary | Pre-intermediate
A2 is the elementary level in the CEFR framework, sitting between A1 and B1. At A2 you can handle routine exchanges — ordering food, asking directions, making small talk — and describe your immediate environment in simple sentences.
Grammatically, A2 introduces past simple and past continuous, present perfect for experiences, basic modal verbs, and the first conditional. You're also picking up collocations and learning which verbs take gerunds vs. infinitives. Knowing your level here is the difference between confident progress and frustration: A2 material consolidates the basics; B1 will overwhelm you.
B1 | Intermediate
B1 is the intermediate level in the CEFR framework — the point where you stop relying on memorised phrases and start handling everyday English independently. At B1 you can describe experiences, explain opinions, and follow most clear standard speech on familiar topics like work, travel, and hobbies.
Grammatically, B1 means combining tenses with precision, building complex sentences, and starting to use passive voice, modal verbs for necessity and possibility, and verb patterns (gerund vs. infinitive). Knowing your level shapes what you study next: pushing too far ahead frustrates you; staying below your level wastes time.
Difficulty: Easy
The Easy difficulty tag marks questions and challenges aimed at beginners — typically A1 or early A2 level. Expect single-rule focus, short sentences, common everyday vocabulary, and one clear correct answer. Distractors usually rule themselves out quickly.
Filter by Easy when you're rebuilding fundamentals, warming up before harder material, or testing whether you've truly internalised a basic rule before moving on. Easy doesn't mean trivial — it means the rule itself is unambiguous and the context doesn't pile on extra complications.