Question

英语do和does的用法，写什么句子的时候用

Answer 1

1) 构成一般疑问句，例如:
Do you want to pass the CET? 你想通过大学英语测试吗?
Did you study German? 你们学过德语吗?

2) do + not 构成否定句，例如:
I do not want to be criticized. 我不想挨批评。
He doesn't like to study. 他不想学习。
In the past, many students did not know the importance of English. 过去，好多学生不知道英语的重要性。

3) 构成否定祈使句，例如:
Don't go there. 不要去那里。
Don't be so absent-minded. 不要这么心不在焉。
说明: 构成否定祈使句只用do，不用did和does。

4) 放在动词原形前，加强该动词的语气，例如:
Do come to my birthday party. 一定来参加我的生日宴会。
I did go there. 我确实去那儿了。
I do miss you. 我确实想你。

5) 用于倒装句，例如:
Never did I hear of such a thing. 我从未听说过这样的事情。
Only when we begin our college life do we realize the importance of English.
只有在开始大学生活时我们才认识到英语的重要性。
说明: 引导此类倒装句的副词有never, seldom, rarely, little, only, so, well等。

6) 用作代动词，例如:
---- Do you like Beijing? --你喜欢北京吗?
---- Yes, I do. --是的，喜欢。(do用作代动词，代替like Beijing.)
He knows how to drive a car, doesn't he?
他知道如何开车，对吧?

Answer 2

do 这个词(does是第三人称单数形式),大体上从两方面来讲.

1.作为行为动词,跟其他动词一样,如study,play等.他的意思是“做”等.如：

We usually do our homework in the afternoon.

He does his homework in the evening.

2.作为助动词,也就是帮助主要动词构成否定和疑问等.

We don't like bananas.

Do you like apples?

Does he like English?

He doesn't like swimming.

上面有一句He does his homework in the evening.要是变成否定句就成了这个样子：

He doesn't do his homework in the evening.

这里加上了助动词doesn't,而原来的主动词does变成原形do了.