have动词的用法说明白点,话用少点.

Have有四种用法：1,动词,“有”的意思。I have a book。我有一本书。Do you have a book?I don’t have a book。（也可以说I haven’t a book。不常用）2,助动词。“使……”have sb do 让某人做have sb doing 让某人一直做have sb/sth done 某人/某物被……3,have to,“不得不,必须”,表示不是主观意愿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,用于完成时have+动词的过去分词