All verbs, regardless of the language, have different forms to indicate the time of action. The various tenses include present, past, future, present perfect, past perfect. We have other tenses too that we will study later. This exercise is to help you learn the present, past and perfect forms of common irregular verbs.
Irregular verbs are a bit more complicated.
The entire form of the word changes in the past and again in the present perfect form. We have no set rule to tell us how to change the irregular verbs from present to past to perfect. Thus, we need to memorize them or learn by repeated practice. Let's see what you know already. After you complete this exercise, you will know which verbs you need to study.