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1、第5章 助動詞一.概念: 助動詞是幫助主要動詞構(gòu)成各種時態(tài),語態(tài),語氣以及否定或疑問結(jié)構(gòu)的動詞.助動詞分為時態(tài)助動詞和結(jié)構(gòu)助動詞兩種.二.相關(guān)知識點精講: 1. 助動詞be的用法 1) be +現(xiàn)在分詞,構(gòu)成進行時態(tài)。例如:They are having a meeting.他們正在開會。English is becoming more and more important. 英語現(xiàn)在越來越重要。2)be + 過去分詞,構(gòu)成被動語態(tài)。例如:The window was broken by Tom.窗戶是湯姆打碎的。English is taught throughout the world.世
2、界各地都教英語。3) be + 動詞不定式,可表示下列內(nèi)容: a. 表示最近、未來的計劃或安排。例如: He is to go to New York next week.他下周要去紐約。 We are to teach the freshmen.我們要教新生。 說明: 這種用法也可以說成是一種將來時態(tài)表達法。 b. 表示命令。例如: You are to explain this.對此你要做出解釋。 He is to come to the office this afternoon.要他今天下午來辦公室。 c.征求意見。例如: How am I to answer him?我該怎樣答復(fù)他?
3、 Who is to go there?誰該去那兒呢? d. 表示相約、商定。例如: We are to meet at the school gate at seven tomorrow morning.我們明天早晨7點在校門口集合。2. 助動詞have的用法 1)have +過去分詞,構(gòu)成完成時態(tài)。例如: He has left for London.他已去了倫敦。 By the end of last month, they had finished half of their work. 上月未為止,他們已經(jīng)完成工作的一半。2)have + been +現(xiàn)在分詞,構(gòu)成完成進行時。例如:
4、 I have been studying English for ten years. 我一直在學(xué)英語,已達十年之久。 3)have +been +過去分詞,構(gòu)成完成式被動語態(tài)。例如: English has been taught in China for many years. 中國教英語已經(jīng)多年。3.助動詞do 的用法 1)構(gòu)成一般疑問句。例如: Do you want to pass the CET?你想通過大學(xué)英語測試嗎? Did you study German?你們學(xué)過德語嗎?2)do + not 構(gòu)成否定句。例如: I do not want to be criticized
5、. 我不想挨批評。 He doesn't like to study. 他不想學(xué)習(xí)。 In the past, many students did not know the importance of English.過去,好多學(xué)生不知道英語的重要性。3) 構(gòu)成否定祈使句。例如: Don't go there.不要去那里。 Don't be so absent-minded.不要這么心不在焉。說明: 構(gòu)成否定祈使句只用do,不用did和does。4)放在動詞原形前,加強該動詞的語氣。例如: Do come to my birthday party.一定來參加我的生日宴會
6、。 I did go there.我確實去那兒了。 I do miss you.我確實想你。5)用于倒裝句。例如: Never did I hear of such a thing. 我從未聽說過這樣的事情。 Only when we begin our college life do we realize the importance of English. 進了大學(xué)以后,我們才認識到英語的重要性。說明: 引導(dǎo)此類倒裝句的副詞有never, seldom, rarely, little, only, so, well等。6)用作代動詞。例如: - Do you like Beijing?-你
7、喜歡北京嗎? - Yes, I do.-是的,喜歡。(do用作代動詞,代替like Beijing.) He knows how to drive a car, doesn't he? 他知道如何開車,對吧?4. 助動詞shall和will的用法 shall和will作為助動詞可以與動詞原形一起構(gòu)成一般將來時。例如:I shall study harder at English. 我將更加努力地學(xué)習(xí)英語。He will go to Shanghai.他要去上海。說明:在過去的語法中,語法學(xué)家說shall用于第一人稱,will 只用于第二、第三人稱?,F(xiàn)在,尤其是在口語中,will常用于第
8、一人稱,但shall只用于第一人稱,如用于第二、第三人稱,就失去助動詞的意義,已變?yōu)榍閼B(tài)動詞,試比較: He shall come.他必須來。(shall有命令的意味。) He will come.他要來。(will只與動詞原形構(gòu)成一般將來時。)5.助動詞should, would的用法 1)should無詞義,只是shall的過去形式,與動詞原形構(gòu)成過去將來時,只用于第一人稱。例如: I telephoned him yesterday to ask what I should do next week. 我昨天給他打電話,問他我下周干什么。 比較:"What shall I do
9、 next week?" I asked. "我下周干什么?"我問道。 可以說,shall變成間接引語時,變成了should。2) would也無詞義,是will的過去形式,與動詞原形構(gòu)成過去將來時,用于第二、第三人稱。例如: He said he would come. 他說他要來。比較:"I will go," he said. 他說:"我要去那兒。"變成間接引語,就成了He said he would come。原來的will變成would,go變成了come.。 6. 短語動詞 動詞加小品構(gòu)成的起動詞作用的短語叫短語
10、動詞。例如:Turn off the radio.把收音機關(guān)上。(turn off是短語動詞)短語動詞的構(gòu)成基本有下列幾種:1)動詞+副詞,如:black out;2)動詞+介詞,如:look into;3)動詞+副詞+介詞,如:look forward to。構(gòu)成短語動詞的副詞和介詞都統(tǒng)稱為小品詞三.鞏固練習(xí)1.If it is fine tomorrow, we _ a football match.a. have b. will have c. has d. shall has2.When he was at school, he _ early and take a walk befo
11、re breakfast.a. will rise b. shall rise b. should rise would rise3.In the past 30 years China _ great advances in the socialist revolution and socialist construction.a. has made b. have made c. had made d. having made4.I _ go to bed until I _ finished my work.a. dont/had b. didnt/have c. didnt/had d
12、. dont/have5._ you think he _ back by dinner time?a. Do/have come b. Did/will have come c. Does/will come d. Do/will have come6.He said that he dropped his bag when he _ for the bus.a. was runing b. was running c. were running d. is running7.No sooner _ he arrived home than he _ to start on another
13、journey.a. has/was asked b. have/were asked c. had/is asked d. had/was asked8.“_ you give me a room for the night?” I asked on arriving at the hotel.a. Should b. Can c. Might d. May9.There are nine of them, so _ get into the car at the same time.a. they may not at all b. all they may not c. they can
14、t all d. all they cant10.“We didnt see him at the lecture yesterday.” “He _ it.”a. mustnt attend b. cannot have attended c. would have not attended d. neednt have attended11.“You realize that you were driving at 100 mph, dont you?” “No, officer. I _. This car cant do more than 80.”a. didnt need to b
15、e b. may not have been c. couldnt have been d. neednt have been12.he was a good runner so he _ escape from the police.a. might b. succeeded to c. would d. was able to13.If they _, our plan will fall flat.a. are co-operating b. had not co-operated c. wont co-operate d. didnt co-operate14.I hoped _ my
16、 letter.a. her to answer b. that she would answer c. that she answers d. her answering15.He _ live in the country than in the city.a. prefers b. likes to c. had better d. would rather16._ to see a film with us today?a. Did you like b. Would you like c. Will you like d. Have you liked17.Im sorry, but
17、 I had no alternative. I simply _ what I did.a. must do b. had to do c. ought to have done d. have to do18.“Time is running out,_?”a. hadnt we better got start b. hadnt we better get startc.hadnt we better get started d. hadnt we better not started19.No one _ that to his face.a. dares say b. dares s
18、aying c. dare say d. dare to say20.The students in the classroom _ not to make so much noise.a. need b. ought c. must d. dare21.You _ last week if you were really serious about your work.a. ought to come b. ought to be coming c. ought have come d. ought to have come22.The elephants ought _ hours ago
19、 by the keepers.a. to be fed b. to feed c. to being fed d. to have been fed23.“I wonder why theyre late.” “They _ the train.”a. can have missed b. could miss c. may have missed d. might miss24.“Tom graduated from college at a very young age.” “He _ have been an outstanding student.”a. must b. could c. should d. might25.You _ the examination again since you had already passed it.a. neednt have taken b. didnt need to take c. neednt take d. mustnt take26.He is really incompetent! The letter _ yesterday.a. should be finished typing b. must be finished typingc.must have finished typing c.
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