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:
be, do 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