( has 3rd person present) ( having present participle) ( had past tense & past participle ) (AUXILIARY VERB USES)
In spoken English, forms of have are often shortened, for example I have is shortened to I've and has not is shortened to hasn't.
1 aux You use the forms have and has with a past participle to form the present perfect tense of verbs.
Alex has already gone... AUX -ed
My term hasn't finished yet... AUX -ed
What have you found so far?... AUX -ed
Frankie hasn't been feeling well for a long time. AUX been -ing
2 aux You use the form had with a past participle to form the past perfect tense of verbs.
When I met her, she had just returned from a job interview... AUX -ed
3 aux Have is used in question tags.
You haven't sent her away, have you?... cl AUX n
4 aux You use have when you are confirming or contradicting a statement containing `have', `has', or `had', or answering a question.
`Have you been to York before?'—`Yes we have.' AUX
5 aux The form having with a past participle can be used to introduce a clause in which you mention an action which had already happened before another action began.
He arrived in San Francisco, having left New Jersey on January 19th... AUX -ed
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"