What Is an Irregular Verb? Definition and Examples
An irregular verb changes its past simple and past participle forms without following the standard -ed pattern. Regular verbs like "walk" follow one rule (walk, walked, walked). Irregular verbs like "go" (go, went, gone) each follow their own pattern.
Some examples: "I go to work every day" becomes "I went to work yesterday." "She eats breakfast at 7am" becomes "She ate breakfast an hour ago." "They take the bus" becomes "They took the bus," and "he broke his phone" comes from "break." None of these add -ed, and none share a single predictable rule.
English has over 200 irregular verbs total, though only about 50-70 appear regularly in everyday speech and writing. That smaller set is what CEFR exams and most textbooks actually test. Learning those 50-70 first gives far better returns than trying to memorize the entire list at once.
Examinizer's keyword research on this topic (1,338 keywords analyzed) shows past-tense forms account for 13.9% of related searches, the largest single intent category. Full-list requests follow at 12.1%, example sentences at 7.2%, practice exercises at 6.6%, and basic definitions at 3.3%. For a fuller breakdown of how irregular forms shift across tenses, see the tenses page.
Most Common Irregular Verbs: Comparison Table
These eight verbs appear constantly in CEFR writing and speaking tasks, which is why they're worth mastering first. The table below shows their base form, past simple, past participle, and one example sentence each.
| Base Form | Past Simple | Past Participle | Example Sentence |
|---|---|---|---|
| be | was/were | been | She was tired after the exam. |
| go | went | gone | They have gone to the test center. |
| have | had | had | He had breakfast before the interview. |
| do | did | done | We did the listening section first. |
| see | saw | seen | I saw the results this morning. |
| take | took | taken | She has taken three practice tests. |
| make | made | made | They made a mistake on question five. |
| get | got | gotten/got | He got his certificate by email. |
Two patterns explain most of the confusion learners report. Some verbs stay identical across all three forms, like put/put/put, while others shift the internal vowel, like sing/sang/sung or take/took/taken. Recognizing which pattern a verb follows saves time during timed writing tasks, since guessing wrong under pressure is a common source of lost points.
Past participles from this table appear constantly in perfect tenses, as in "have gone" or "has taken." The rules for combining these forms with have are explained on the tenses page. The same past participles also show up in passive voice constructions, such as "was made" or "has been done," covered on the passive voice page.
CEFR Level Breakdown: When Irregular Verbs Are Taught (A1-C2)
The Council of Europe's CEFR framework defines six proficiency levels, and irregular verb instruction follows a set progression across them. A1 learners meet just 10-15 core irregular verbs, including be, have, go, and do, enough to form basic sentences about daily life.
A2 and B1 push that number to 40-50 irregular verbs. This is where past simple narratives enter the picture: learners start telling stories about what happened rather than just naming actions. B2 and C1 shift the focus from raw quantity toward precision. Less common irregular verbs appear alongside past participle forms used in perfect and passive structures, such as "the report had been written" or "the decision was taken." By C2, full mastery is expected, including rare or literary irregular verbs that show up in formal writing and classic texts but rarely in everyday speech.
For structured level practice, the modal verbs guide covers related grammar points tested alongside irregular verbs at B1 and above. The English grammar test offers level-appropriate exercises to check where your irregular verb knowledge actually stands.
Common Mistakes with Irregular Verbs
Three errors account for most mistakes learners make with irregular verbs. Each one comes from applying a rule that works for other verbs but not this one.
The first mistake is adding -ed to a verb that already has its own past form, producing "goed" instead of "went" or "buyed" instead of "bought." The second is mixing up past simple with past participle, as in "I have went" instead of "I have gone." This happens because some verbs share one form for both (say, said), while others don't, and learners assume the pattern applies universally. The third mistake is overgeneralizing from similar-looking verbs: seeing "ring, rang, rung" and wrongly applying the same vowel shift to "bring," producing "brang" instead of "brought."
Three grouping strategies make memorization faster. Group verbs by vowel pattern (sing/sang/sung, drink/drank/drunk). Group verbs that don't change at all (cut, put, cost). Group verbs with irregular but shared endings (buy/bought, catch/caught, teach/taught). Reviewing 10-15 verbs per group, rather than the full list at once, cuts recall errors during practice.
For structured drills on past simple versus past participle forms, visit the grammar exercises section.
How Learners Search for Irregular Verb Help
Past-tense forms dominate irregular verb searches, according to Examinizer's keyword analysis of 1,338 related search terms. List-seeking queries such as "list of irregular verbs" rank second, followed by requests for example sentences, practice exercises, and basic definitions.
The breakdown: past-tense form searches make up 13.9% of the total (186 of 1,338 keywords), list requests 12.1%, example-seeking queries 7.2%, exercise and practice queries 6.6%, and definition or "what is an irregular verb" queries 3.3%.
The pattern points to one conclusion: most learners already know roughly what irregular verbs are. What they want is a fast, reliable reference for past simple and past participle forms, not another explanation of grammar theory. Quick-scan lists and side-by-side comparisons of base, past, and participle forms serve this need better than long paragraphs on verb classification.
To check where your irregular verb knowledge stands, Examinizer runs a 25-question grammar test in 20-25 minutes, covering patterns across CEFR levels rather than past tenses alone. A PDF certificate arrives by email within 30 seconds for €8 (incl. 21% EU VAT = €9.68). The test works as a placement check and does not replace an accredited exam.