“Have” as auxiliary

How “have” is used as an Auxiliary verb

Have – as an auxiliary is used to form verbs in their perfect form in all tenses (affirmative, negative and interrogative)

• Present Perfect:

• I have worked here for ten years
• Has John worked in New York?

• Present perfect continuous:

• It  has been snowing all night.
• Have you been running? Your face is very red.

• Past Perfect:

• When I arrived the train had already left.
• Had you met his parents before last weekend?

•  Past Perfect Continuous:

• When I arrived at the match they had already been playing for 15 minutes.
• Meena hadn’t been running for even five minutes when she fell over and broke her leg.

• Future Perfect:

• Ahmed will have finished at university by this time next year.
• Flora and April will have had five hours of classes by the end of the day.

• Future Perfect Continuous

• By the end of the month I will have been working here for ten years. How time flies!

There are a lot of different ways to practise English grammar here are some more lessons.