has,have在什么时候用？举一下例子

第一人称、第二人称单数、复数都用have，如：
I have a book. / You have a book, too.
we have some books./ You don't have book.
一般现在时中，第三人称单数的时候用has，复数还是用have，如：
He has a book.
They have some books.

第三人称单数用has. 比如， He has a car.
第一人称用have.比如, I have a car.