Auxiliary verbs are verb that comes before another verb in order to form a question, a negative sentence, a tense or a passive sentence. Auxiliary verbs are also called helping verbs. 

The three most common auxiliary verbs are:

bedo and have

- I am leaving = Leaving is the main verb. Am is the auxiliary.

- She has arrived = Arrived is the main verb. Has is the auxiliary.

- Do you smoke? = Smoke is the main verb. Do is the auxiliary.


The “Big Three” auxiliary verbs, in all their forms, includes: 

be, been, am, is, are, was, were, have, has, had, do, does, did



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