A: Have you done your homework yet?
B: Well, I haven't finished it, but I'm doing it now.
Three Kinds of Verbs
1. Auxiliary Verbs: Be, Do, Have
These are used to change tenses or to make questions and negative sentences. Many teachers and students call auxiliary verbs “helping verbs” because they help the main verb of a sentence.
I don't like traveling to cold countries.
He has already seen the movie.
Are they leaving now?
2. Modal Auxiliary Verbs: Can, Will, May, Should, etc.
These are similar to the auxiliary verbs be, do, and have because they help a main verb in a sentence. They are different because they each have a special meaning.
In the following examples, may means maybe, can't means impossible or unable, and should is asking for advice:
It may rain tonight.
We can't get to the airport in five minutes.
Should I pay a tip for that in Italy?
3. Full Verbs: Go, Play, Sing, etc.
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