have的用法
1)have +过去分词,构成完成时态。例如:
He has left for London. 他已去了伦敦。
By the end of last month, they had finished half of their work. 上月未为止,他们已经完成工作的一半。
2)have + been +现在分词,构成完成进行时。例如:
I have been studying English for ten years. 我一直在学英语,已达十年之久。
3)have +been +过去分词,构成完成式被动语态。例如:
English has been taught in China for many years. 中国教英语已经多年。
do 的用法
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. 进了大学以后,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?