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1、精選優(yōu)質(zhì)文檔-----傾情為你奉上 情態(tài)動詞與虛擬語氣 一、情態(tài)動詞 考點一　can和could的用法 1．表示驚訝，常用在否定句和疑問句中。 How could you do such a silly thing? 你怎么能做那樣的蠢事呢？ 2．表示可能性，意為“可能，有時會”。can和could沒有時態(tài)的差異，只是could不太肯定。 Jogging can be harmful to the health.慢跑可能會對健康有害 Accidents can/could happen on such rainy days. 這樣的多雨天氣可能會發(fā)生交通事故。(客觀的可能性

2、) 3．can用于否定句，意為“應(yīng)該不是，不可能”。 I think it's all right. She can't make a mistake. 我想應(yīng)該沒事，她不可能犯錯誤。 4．cannot...too/enough表示“無論……也不過分”；“越……越好”。 You can't be too careful while driving. 開車時越小心越好。 You cannot remember enough English words. 你記的英語單詞越多越好。 5．cannot but＋do sth.表示“不得不，只好”。 I couldn't but ch

3、oose to go. 我只好去。 根據(jù)句意可知答案為B。 考點二　may和might的用法 may和might表示“許可”，“可能性”，“祝愿”等意義。 1．表示許可。May I come in? Might I borrow your computer? 2．表示可能性。 may和might表示可能性時，可以對現(xiàn)在、過去或?qū)磉M行推測。 Peter may come with us tonight, but he isn't sure yet. 彼得今晚可能和我們一起來，但他還沒確定。(實際可能性，不用can) 3．“may as well＋動詞原形”意為“最好，滿可以

4、，倒不如”。 You may as well do it at once. We may as well stay where we are. 4．may作“可以”講時，其否定式常用mustn't表示“禁止”；must作“必須”講時，其否定式是“needn't”，表示“不必”。 —May I use your car? —No, you mustn't.(委婉的拒絕可用：Sorry，but I am using it now.或You'd better not.等)不，你不可以。 考點三　must的用法 1．表示義務(wù)，意為“必須”(主觀意志)。 We must do every

5、thing step by step. 在這種用法中must表示出于主觀意識而必須要做某事，have to表示由于某種客觀原因而不得不做某事。除此以外，have to自身有時態(tài)的變化。 I have to go now for I've got a meeting 15 minutes later. 注意：回答以must引導(dǎo)的問句時，若是否定回答，不可以用mustn't而用needn't或是don't have to，因為mustn't意思是“絕不能，一定不要”，而沒有“不必”的意思。 —Must we hand in our exercises today? —Yes, you m

6、ust. 是的，必須交。(肯定回答) /—No, you needn't (you don't have to)． 不，不必今天交。(否定回答) —Must I work out the problem tonight? —No, you needn't. 2．表示猜測、推測。 must常用于肯定句中表示猜測。(對現(xiàn)在或未來的事進行猜測時，后接動詞原形；對已經(jīng)發(fā)生的事進行猜測時，后接have＋過去分詞。) He must be ill. He looks so pale. I didn't hear the phone. I must have been asleep. 3．

7、表示禁止(用于否定句)。 Smoking must not be allowed in the office. 4．表示“偏執(zhí)”，“固執(zhí)”。 Must you make so much noise? If you must smoke, please go out. 考點四　shall的用法 1．第一、第三人稱疑問句中，表示說話人征求對方的意見和向?qū)Ψ秸埵尽? Shall we begin our class? Shall the driver wait outside? 2．第二、第三人稱陳述句中，表說話人給對方的命令、警告、允諾或威脅。 I promised

8、he shall get a present for his birthday. You shall not get my support if you do such a thing. 考點五　will和would的用法 1．表示自愿做或主動提出做什么，如意志、愿望或決定等。 would用于過去的情況。 —Can someone fetch some water? —I will. 2．與you連用表示請求或要求：用won't you強調(diào)邀請的語氣。would比will更客氣、委婉。 Would you mind opening the window for me? 3．w

9、ill表示規(guī)律性的“注定會”。 You will regret forever if you lose the chance. 如果失去這個機會你會后悔一輩子的。 考點六　need和dare的用法 need和dare既可用作情態(tài)動詞，也可用作實義動詞。用作情態(tài)動詞時，主要用于否定句和疑問句。用作實義動詞時，可用于各種句式。 1.做情態(tài)動詞You needn't telephone him now. She dare not go out alone at night. 2．用作實義動詞 You don't need to do it yourself. The table n

10、eeds painting (to be painted)． We should dare to give our own opinion. He did not dare to look up. 可知，空白處填Need。答句意為“還需要問嗎？當(dāng)然是蒂姆了。” 考點七　used to和would 1．表示過去重復(fù)、習(xí)慣性動作時，used to可用would代替。 He would sit at the door waiting for his son coming back. 2．used to強調(diào)過去與現(xiàn)在對比，would則沒這個意思。 He used to get up ea

11、rly. 他以前常常起得很早。(他現(xiàn)在不早起了) 3．表示過去的狀態(tài)，只能用used to，不可以用would。 There used to be a tree in my yard. 考點八　could/might/would/should表委婉的功能 —Could/Might I use your bike tomorrow morning? —Yes, you can/may.(否定：No, I'm afraid not.) 好，你可以(用)。(不，恐怕不行。) 不可說：Yes, you could/might.回答允許時，用could/might表委婉是不恰當(dāng)?shù)摹? —

12、Could I borrow your dictionary? —Yes, of course you can. Would you do me a favor? 考點九　“情態(tài)動詞＋have done”的用法 1．must have done 此結(jié)構(gòu)常用在肯定句中，表示對過去發(fā)生的行為的推測，意為“一定，肯定”。其否定或疑問形式用can't，而不用mustn't。 He must have been drunk to say that. 他準(zhǔn)是喝醉了才那樣說的。 2．should＋have done 表示本應(yīng)該做而實際上沒有做，其否定式“shouldn't have done

13、”表示某種行為不該發(fā)生卻發(fā)生了。 I think he should have tried to get more qualifications before applying for the job. 我認為他在申請這份工作之前應(yīng)首先努力取得更多的資格證明。 3．can (could)＋have done 肯定式表示本來可以做而實際上未能做某事，疑問或否定形式表示對過去發(fā)生的行為懷疑或不肯定。 You could have told me you were going to be late. 4．may (might)＋have done 表示對過去(將來)發(fā)生的行為的推測，表示

14、可能干了某事。 Who knows what will happen? You may even have married by then. 誰知道會發(fā)生什么呢？到那時你甚至可能已經(jīng)結(jié)婚了。 5．ought to＋have done 表示過去應(yīng)做某事而實際未做，其否定式是“ought not to＋不定式完成式”，此時ought to可與should換用。 What you ought to have done is call the police. 6．needn't＋have done 表示本來不必做某事而實際上做了某事。 Terence has done so littl

15、e work; he needn't have bothered to come to school today. 特倫斯幾乎沒做什么功課，他今天其實就不用來學(xué)校。 二、虛擬語氣 考點一　虛擬語氣用于狀語從句中 1．虛擬語氣用于非真實條件句 條件從句 主句 例句 與現(xiàn)在事實相反 If I (we，you，he，she，it，they)＋動詞過去式(be的形式一律用were) I (we，you，he，she，it，they)＋would/should/could/might＋動詞原形 If he were indoors, he wouldn't feel so co

16、ld. 與過去事實相反 If I (we，you，he，she，it，they) had＋過去分詞 I (we，you，he，she，it，they)＋would/should/could/might＋have done If you had taken my advice, you wouldn't have failed in the examination. 與將來事實相反 A式：If＋主語＋一般過去時 B式：If＋主語＋were to do C式：If＋主語＋should do I (we，do，he，she，it，they) would/should/could/m

17、ight＋動詞原形 A：If he were here this evening, we would play cards. B：If she were to marry Jack, she would be happy. C：If she should know it, she would tell me. 2．虛擬條件句和主句動作如發(fā)生的時間不一致，主句和從句的謂語要根據(jù)各自所指的不同時間選用適當(dāng)?shù)奶摂M語氣形式，這種句子叫做錯綜時間條件句。 If I were you, I wouldn't have missed the film last night. 如果我是你，我就

18、不會錯過昨晚那部電影了。(現(xiàn)在→過去) If they had left home in early morning, they would arrive in half an hour. 要是他們一大早離開家的話，再過半個小時就該到了。(過去→將來) 3．蓄虛擬條件句，有時虛擬條件不用從句，而是通過上下文或用介詞短語等表示出來，常用的介詞有with，without，but for等。 But for your help, we couldn't have succeeded. Without electricity life would be quite different tod

19、ay. [考題印證] I ________ to my cousin's birthday party last night, but I was not available. A．went B．had gone C．would go D．would have gone 考點二　虛擬語氣用于名詞性從句中 1．用于賓語從句中。 (1)wish后面所跟賓語從句中的虛擬語氣。 表示對現(xiàn)在情況的虛擬：wish＋主語＋動詞過去式或were 表示對過去情況的虛擬：wish＋主語＋had＋過去分詞 表示對將來情況的虛擬：wish＋主語＋would/could

20、＋動詞原形 I wish (that) I were a bird and could fly freely in the sky. How I wish I had listened to my parents' advice! How I wish it weren't raining now. [考題印證] —Let's play football together tomorrow afternoon. —OK, but how I wish I________ it as skillfully as you. A．played B．have played C．h

21、ad played D．will play (2)用于表示建議、愿望、命令等詞后的賓語從句中，常見的動詞有：demand，order，require，insist，suggest，propose，advise等。賓語從句中的虛擬語氣結(jié)構(gòu)為“should＋動詞原形”，should可以省略。 He suggested that we (should) start off early the next day. (3)在would rather后的賓語從句中，也用虛擬語氣，其結(jié)構(gòu)為： would rather sb.＋ I would rather they didn't hear

22、 of the news. I would rather you hadn't told him the news yet. 2．用于主語從句中。 It is desired/suggested/proposed/recommended/necessary/important/strange/natural/a pity/essential＋that從句，從句中的謂語動詞用“should＋動詞原形”，should可以省略。 It is suggested that the meeting (should) be put off till next week. It is strang

23、e that he (should) have acted toward his parents like that.(act在主句謂語動詞be之前發(fā)生，所以要用“should have acted”)真奇怪他竟然那樣對他父母。 [考題印證] It's strongly suggested that measures ________ students to cheat in the exams. A．be taken to prevent B．be taken to forbid C．a(chǎn)re taken to prevent D．a(chǎn)re taken to forbid 3．

24、用于表語從句和同位語從句中。 在suggestion，proposal，order，plan，idea，request，advice等名詞后的表語從句和同位語從句中要用虛擬語氣，其構(gòu)成是“should＋動詞原形”，should可以省略。 My idea is that we (should) think it over before accepting it. We all agreed to his suggestion that we (should) go to Dalian for sightseeing. 4. 當(dāng)insist表“堅持說，認為”、suggest 表“暗示，表明

25、”、advice 表“通知，告知”這些特殊意思時，從句中不用虛擬語氣 His pale face suggested that he was ill, so his mother suggested he go to hospital. They advised that the goods had arrived and advised we should take them away as soon as possible. 考點三　特殊句型中的虛擬語氣 1．it is (high/about) time (that)．..句型中的虛擬語氣。 句型“it is (high/ab

26、out) time (that)．..”后面也可跟虛擬語氣，從句中常用過去式。有時也用“should＋動詞原形”，意為“該是……的時候了”。 It is time (that) we went home. It's high time that we ________ ourselves to environmental protection and ecological improvement. A．hae devoted B．devoted C．a(chǎn)re devoting D．had devoted 2．if only引導(dǎo)的感嘆句中的虛擬語氣。 在“if only”引導(dǎo)的

27、感嘆句中，要求用虛擬語氣，表示愿望。用過去時或“would/could/might＋動詞原形”表示與現(xiàn)在或?qū)硎聦嵪喾吹脑竿?；用過去完成時表示與過去事實相反的愿望。 If only I had not been ill last week! 3．a(chǎn)s if從句中的虛擬語氣。 as if從句中，看語境是否與事實相反而選擇是否使用虛擬語氣。 It looks as if it's going to rain. The kid talks as if he were a grown-up. [考題印證] Don't handle the vase as if it ________ made of steel. A．is B．were C．has been D. had been 專心---專注---專業(yè)