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Did you mean "irregular verb"?
Irregular verbs are verbs that have an irregular pattern, which is the contrast of regular verbs.
Examples of irregular verb:
begin --> began --> begun
begin=present tense began=past tense begun=past participle
Sentence: The test has begun.
fly --> flew --> flown
fly=present tense flew=past tense flown=past participle
Sentence: My birds flew away.
put --> put --> put
This verb is a little different because the present tense, the past tense, and the past participle are the same.
Sentence: I put the book on the shelf.
Here's a list of irregular verb:
http://en.wikipedia.org/wiki/List_of_English_irregular_verbs
Example of regular verb:
play --> played --> played
play=present tense played=past tense and past participle
Sentence: I have played is game before.
study --> studied --> studied
study=present tense studied=past tense and past participle
Sentence: I have studied yesterday.