Hi!
Use "has" in the third person singular (with
he / she / it) and "have" in all other persons:
They
have lived here since 1990.
We
have just arrived.
I
haven't visited them for two years.
Have you read 'Romeo and Juliet'?
He
has never been to England.
My sister
has already seen this film.
This watch was working all right a moment ago, but now it
has stopped.
Has she done all the housework?
Hope it helps!