An auxiliary verb accompanies a main verb to help express its tense, mood, or voice. The most common auxiliary verbs are be, do, and have .
Here are some examples of auxiliary verbs expressing tense
- I have been sitting here since 7 o’clock.
- Sarah was waiting for the shark to reappear.
- John will have broken the record by then.
Here are some examples of auxiliary verbs expressing voice:
- Unfortunately, our ice cream has been eaten by the cat.
- The broadband will be disconnected tomorrow.
Here are some examples of auxiliary verbs being used to express mood:
- If he should arrive, tell him to leave.
- If he were to arrive in the next 10 minutes, we would still be on track.