Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: habban

have

1 auxiliary verb
     
have1 S1 W1 past tense and past participle had third person singular has
1XX used with past participles to form perfect tenses:
Our guests have arrived.
Has anyone phoned?
We've been spending too much money.
I hadn't seen him for fifteen years.
'I hope you've read the instructions.' 'Yes, of course I have.'
You haven't done much, have you?
2

somebody had better/best do something

used to say that someone should do something:
You'd better phone to say you'll be late.
We'd better not tell Jim about our plans just yet.
3

had somebody done something

formal if someone had done something:
Had we known about it earlier, we could have warned people of the danger.

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