a. Primary Auxiliaries - Forming Tenses & Voice
The primary auxiliaries are be, have, and do. They can also function as main verbs.
- Be (is, am, are, was, were, being, been):
- Used to form progressive (continuous) tenses (showing an ongoing action):
She is singing. They were playing. - Used to form the passive voice (where the subject receives the action):
The song was sung by her. The rules are explained.
- Used to form progressive (continuous) tenses (showing an ongoing action):
- Have (has, have, had):
- Used to form perfect tenses (showing an action completed before another point in time or continuing to the present):
We have finished our meal. He had left before I arrived.
- Used to form perfect tenses (showing an action completed before another point in time or continuing to the present):
- Do (does, do, did):
- Used to form questions in simple tenses:
Do you like ice cream? Did he see the movie? - Used to form negatives in simple tenses (with 'not'):
I do not (don't) know. She does not (doesn't) agree. - Used for emphasis in affirmative statements:
I do believe you! He did apologize.
- Used to form questions in simple tenses: