Have有四種用法：
1,動(dòng)詞,“有”的意思.
I have a book.我有一本書.
Do you have a book?
I don’t have a book.（也可以說I haven’t a book.不常用）
2,助動(dòng)詞.“使……”
have sb do 讓某人做
have sb doing 讓某人一直做
have sb/sth done 某人/某物被……
3,have to,“不得不,必須”,表示不是主觀意愿
It’s dark outside,I have to go home.天黑了,我不得不回家.
Do you have to…….
I don’t have to…….
4,用于完成時(shí)
have+動(dòng)詞的過去分詞