英语助动词知识点【汇总3篇】
协助主要动词构成谓语的词叫助动词,它具有语法意义,但没有词汇意义,下面小编给大家分享一些英语助动词知识,希望能够帮助大家,欢迎阅读!
助动词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。
助动词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 ofEnglish.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 ofEnglish.
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?
助动词be的用法
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 tomorrowmorning.我们明天早晨7点在校门口集合。