英语中be,do,have如何应用啊?特别是在什么情况下用do?
2个回答

e

1) be +现在分词,构成进行时态,例如:

They are having a meeting.他们正在开会.

English is becoming more and more important.英语现在越来越重要.

2) be + 过去分词,构成被动语态,例如:

The window was broken by Tom..窗户是汤姆打碎的.

English is taught throughout the world.世界各地都教英语.

3) be + 动词不定式,可表示下列内容:

a.表示最近、未来的计划或安排,例如:

He is to go to New York next week..他下周要去纽约.

We are to teach the freshpersons.我们要教新生.

说明:这种用法也可以说成是一种将来时态表达法.

b.表示命令,例如:

You are to explain this.对此你要做出解释.

He is to come to the office this afternoon.要他今天下午来办公室.

c.征求意见,例如:

How am I to answer him?我该怎样答复他?

Who is to go there?谁该去那儿呢?

d.表示相约、商定,例如:

We are to meet at the school gate at seven tomorrow morning.我们明天早晨7点在校门口集合.

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do

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?

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have

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