What are some irregular past tense verbs?

Irregular verbs don’t follow the regular rules for forming the simple past tense and the past participle form. While regular verbs need the addition of “-ed” (or “-d” if the verb already ends in “e”), irregular verbs can change in a variety of ways or not change at all.

Here are some examples of irregular verbs in the simple past and past participle forms:

Base form Simple past Past participle
be (is, am, are) was/were been
do did done
eat ate eaten
go went gone
sing sang sung