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.

    ______________________________________________________________________

    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?

    ______________________________________________________________________

    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