An irregular verb is a verb that does not follow the standard patterns of conjugation in the past tense and past participle forms. Unlike regular verbs, which typically add “-ed” to the base form (like “walk” becoming “walked”), irregular verbs change in various ways, often unpredictably.

For example:

Go: go, went, gone

Be: am/is/are, was/were, been

Have: have, had, had

Each irregular verb has its own unique set of forms, so they need to be memorized rather than following a simple rule.