Additionally, we can note that the word “have” has been added in the past tense. However, you should pay attention to irregular verbs (learn more about irregular verbs). How to use Modals in the Present and Past ExampleĪs you can see in these two examples, the main verb “see” becomes “seen” after changing tense from present to past.
However, when changing the main verb tense from present to past, we see some slight differences. Modals are verbs that do not change, and they always come before the main verb in a sentence.
