In the case of irregular verbs, even the root changes.

Today we will devote the whole time to irregular verbs.

The following table gives principal parts for a number of irregular verbs.

Most irregular French verbs can be described with seven principal parts.

The teacher drilled the class with the irregular verbs for a couple of days until everyone knew them.

The following is a list of the irregular verbs that generally occur in standard modern English.

Students of the history of science had better know their irregular verbs if they are going to do any real research in the field.

There are, however, some exceptions, like with irregular verbs in other languages.

I'm working hard at French, cramming five irregular verbs into my head every day.

Nearly all of the basic irregular verbs are single-syllable words.