did(一般过去时),have(
现在完成时),do(
一般现在时),does(一般现在时,主语为三单),has(现在完成时,主语为三单),had (
过去完成时)这些词都可以是助动词,用于不同时态的否定句和疑问句
另外,这些词也可以是
实义动词做:do(一般现在时) I do my homework every day.
does(一般现在时,主语为三单) My mother does housework every day.
did(一般过去时)They did their best yesterday.
有:have(一般现在时) I have a book.
has(一般现在时,主语为三单) She has a pen.
had (一般过去时) They had dinner at 7 yesterday.本回答被提问者采纳