高考英語(yǔ)一輪總復(fù)習(xí) 語(yǔ)法專(zhuān)項(xiàng)突破 考點(diǎn)精講 第七節(jié) 情態(tài)動(dòng)詞和虛擬語(yǔ)氣

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1、高考英語(yǔ)一輪總復(fù)習(xí) 語(yǔ)法專(zhuān)項(xiàng)突破 考點(diǎn)精講 第七節(jié) 情態(tài)動(dòng)詞和虛擬語(yǔ)氣 考點(diǎn)一 情態(tài)動(dòng)詞的基本用法 1.can的用法 (1)表示能力。需注意的是,could表示過(guò)去一般的能力,而was/were able to表示有能力而且成功地做成了某事。 The fire spread through the building very quickly, but everyone was able to get out.盡管這場(chǎng)大火迅速蔓延了整個(gè)大樓,但是每個(gè)人都逃了出去。 (2)表示理論上的可能性,意為“有時(shí)候可能會(huì)”。 Everything can happen, everything i

2、s possible and probable. 任何事情都有可能發(fā)生, 沒(méi)有什么是不可能的。 (3)表示請(qǐng)求和允許。在問(wèn)句中,could比can語(yǔ)氣要委婉。 —Could I use your bike? 我可以用你的自行車(chē)嗎? —Of course you can. 當(dāng)然可以。 (4)表示推測(cè),常用于疑問(wèn)句和否定句。 What can they be doing there? 他們可能正在那里干什么? He can't be in the classroom, for the light has been turned off. 他不可能在教室,因?yàn)闊粢殃P(guān)了。 (5)

3、can't/never ... too/enough表示“再……也不為過(guò)”。 You can never be too careful while driving a car. 開(kāi)車(chē)時(shí)再小心都不為過(guò)。 2.may的用法 (1)表示請(qǐng)求、允許,此時(shí)might比may的語(yǔ)氣更委婉。 —May/Might I play basketball this afternoon? 今天下午我可以打籃球嗎? —No, you may not. 不,不行。 (2)表示推測(cè)意為“可能、或許”。 We may go to the cinema tonight, but we are not sure

4、 yet.我們今晚或許去看電影,但還未確定。 (3)用于祈使句中表示祝愿。 May you be happy every day and succeed in your work! 祝你每天都過(guò)得開(kāi)心且工作順利! (4)“may as well+動(dòng)詞原形”意為“最好,倒不如”。 There is nothing to do, so I may as well go to bed. 沒(méi)什么事可做, 我還是上床睡覺(jué)好了。 3.must的用法 (1)表示“必須;應(yīng)該”,must一般指主觀,而have to指客觀表示“不得不”。 We must do everything step by

5、 step. 我們一切都必須循序漸進(jìn)地做。 I have to go now for I've a meeting 15 minutes later.我必須走了,因?yàn)?5分鐘后有個(gè)會(huì)。 (2)表示推測(cè)意為“一定會(huì)”,此時(shí)不能用于否定句。 He must be ill. He looks so pale. 他一定病了,他的臉色蒼白。 (3)mustn't表禁止,而have to的否定式意為“不必”。 Smoking mustn't be allowed in the office. 辦公室里不許吸煙。 —Must we hand in our exercise today?

6、我們今天必須交作業(yè)嗎? —No, you don't have to. 不,不必今天交。 (4)表示偏執(zhí)、固執(zhí)意為“偏要,硬要”。 If you must smoke, please go out. 如果你硬要吸煙,那就出去吧。 4.shall的用法 (1)用于第一、三人稱(chēng)的疑問(wèn)句中,用于征求對(duì)方的意見(jiàn)。 Shall I buy some picture books for the children? 要我給孩子們買(mǎi)些圖畫(huà)書(shū)嗎 ? (2)用于第二、三人稱(chēng)的陳述句,表示說(shuō)話人給對(duì)方的命令、警告、允諾或威脅;此外,當(dāng)頒布法律、規(guī)定時(shí)也用shall。 You shall finis

7、h your homework first before you go out and play. 你得先做完作業(yè)再出去玩。 5.should的用法 (1)表示勸告和建議,意為“應(yīng)該”。此時(shí)ought to比should語(yǔ)氣要強(qiáng)。 You should/ought to put more effort into your work.你應(yīng)該更加努力地工作。 (2)表示預(yù)測(cè)可能性,意為“按道理應(yīng)該會(huì)”。 He left Paris in the morning. So he should arrive here by supper time. 他早上離開(kāi)巴黎, 因此他晚飯前應(yīng)該能到。

8、 (3)表示驚訝、意外等情緒,意為“竟然”。 It is strange that such things should happen in our school.真奇怪,這樣的事情竟然在我們學(xué)校發(fā)生了。 6.will/would的用法 (1)表示意愿,可用于各種人稱(chēng)。 We will never give up working, whatever happens. 無(wú)論發(fā)生什么事,我們都不會(huì)放棄工作。 (2)表示“請(qǐng)求;建議”,此時(shí)would比will更委婉。 Would you e into the bar and have a drink with me? 你愿意進(jìn)酒吧和我

9、喝一杯嗎 ? (3)表示習(xí)慣,意為“總是,習(xí)慣于”。與used to相比,would表示過(guò)去重復(fù)、習(xí)慣性動(dòng)作;而used to則強(qiáng)調(diào)過(guò)去與現(xiàn)在的對(duì)比。 Last year our English teacher would tell us stories in English after class. 去年我們的英語(yǔ)老師常常課后給我們用英語(yǔ)講故事。 He used to spend all his money on food and drink; now he lives a simple life. 他過(guò)去把錢(qián)都花在吃喝上, 現(xiàn)在可節(jié)省了。 7.need/dare的用法 nee

10、d和dare既可作實(shí)義動(dòng)詞又可作情態(tài)動(dòng)詞,用作情態(tài)動(dòng)詞時(shí),主要用于疑問(wèn)句和否定句。 You needn't worry about him. 你不必為他擔(dān)心。 She dare not go out alone at night. 她晚上不敢一個(gè)人出去。 考點(diǎn)二  “情態(tài)動(dòng)詞+have done”的用法 類(lèi)型 構(gòu)成 主要用法 表示對(duì) 過(guò)去的 推測(cè) must have done 表示對(duì)過(guò)去發(fā)生的事情十分肯定的推測(cè),意為“想必/準(zhǔn)是/一定做過(guò)某事”。 can/could have done 多用于否定句和疑問(wèn)句,表示對(duì)過(guò)去發(fā)生的行為的懷疑和不肯定,意為“不可能已經(jīng)

11、……”或“可能已經(jīng)……了嗎?”。 may/might have done 用于肯定句和否定句,表示對(duì)過(guò)去發(fā)生某事的可能性的推測(cè),意為“或許做過(guò)某事”或“或許沒(méi)做過(guò)某事”。 表示后 悔、責(zé)備 或遺憾 can/could have done 用在肯定句中,表示對(duì)過(guò)去沒(méi)有實(shí)現(xiàn)的可能性的遺憾,意為“本來(lái)能做……實(shí)際上卻未做”。 should/ought to have done 表示本該做某事而實(shí)際上未做;否定式表示本不該做但卻做了。 needn't have done 表示做了本來(lái)不必做的事。 The accident mus

12、t have happened at about 11 o'clock in the morning. 事故一定是發(fā)生在上午11時(shí)左右。 He can't have gone to Shanghai, for I saw him a minute ago. 他不可能去了上海, 因?yàn)槲覄偛胚€看見(jiàn)他。 He might have said so at the meeting, but I'm not sure.他或許在會(huì)上說(shuō)過(guò)這樣的話,但我不確定。 You could have done better, but you didn't try your best.你本來(lái)能做得更好,但你

13、沒(méi)盡全力。 I was really anxious about you.You shouldn't have left home without a word. 我真的為你擔(dān)心,你本不該不打聲招呼就離開(kāi)家。 You needn't have told him the news; he knew it already. 你不必再告訴他這個(gè)消息, 他已經(jīng)知道了。 考點(diǎn)三 虛擬語(yǔ)氣在非真實(shí)條件句的用法 說(shuō)明 if從句謂語(yǔ)動(dòng)詞 主句謂語(yǔ)動(dòng)詞 與現(xiàn)在事 實(shí)相反 動(dòng)詞的過(guò)去式(be用were) would/should/ could/might+動(dòng)詞原形 與過(guò)去事 實(shí)相反

14、 had+過(guò)去分詞 would/should/ could/ might+have+過(guò)去分詞 與將來(lái)事 實(shí)相反 動(dòng)詞的過(guò)去式(be用were)/should+動(dòng)詞原形/were to+動(dòng)詞原形 would/should/ could/ might+動(dòng)詞原形 If I were you, I would take action right away. 如果我是你,我會(huì)立即采取行動(dòng)。 If you had got up earlier, you would have caught the train. 如果你早點(diǎn)起床, 你就會(huì)趕上火車(chē)了。 If you should fail,

15、what would you do? 萬(wàn)一你失敗了, 你準(zhǔn)備怎么辦? 考點(diǎn)四 虛擬條件的三種特殊形式 1.省略if的虛擬語(yǔ)氣 如果if從句中含有were/had/should,則可以把if省略,把這三個(gè)詞置于句首形成倒裝。 Were it Sunday tomorrow, we should go to the Great Wall. 要是明天是星期日, 我們就能去長(zhǎng)城了。 2.錯(cuò)綜時(shí)間條件句 如果虛擬條件句的動(dòng)作與主句動(dòng)作發(fā)生的時(shí)間不一致,這時(shí)被稱(chēng)作錯(cuò)綜時(shí)間條件句,動(dòng)詞的形式應(yīng)根據(jù)它們各自表示的時(shí)間做出相應(yīng)的調(diào)整。 If you had prepared in advan

16、ce, you wouldn't be in such an awkward position now. 如果你事先做好準(zhǔn)備, 現(xiàn)在就不至于那么被動(dòng)。 3.含蓄虛擬條件句 有時(shí)假設(shè)的情況不是以if條件從句表示,而是通過(guò)其他形式表現(xiàn)出來(lái),這時(shí)被稱(chēng)作含蓄虛擬條件句,其用法主要有三。 (1)用but for,without等介詞(短語(yǔ))表示條件。 But for the rain we should have had a pleasant journey.要不是下雨, 我們會(huì)有一次愉快的旅行。 (2)用連詞otherwise,or等暗示后文與前面的情況相反,從而引出后文的虛擬語(yǔ)氣。

17、There was a traffic jam on the way,otherwise I would have arrived an hour ago. 路上堵車(chē), 要不然我一小時(shí)前就到了。 (3)虛擬條件通過(guò)but暗示出來(lái),but前面為虛擬語(yǔ)氣,后面為真實(shí)情況。 I should have given you more help, but I was too busy.我本該多幫幫你,但我太忙了。 考點(diǎn)五 虛擬語(yǔ)氣的其他情況 1.用于賓語(yǔ)從句中 (1)wish后的虛擬語(yǔ)氣 wish后賓語(yǔ)從句的虛擬語(yǔ)氣有三種表達(dá)方式: ①過(guò)去時(shí)→表現(xiàn)在;②過(guò)去完成時(shí)→表過(guò)去; ③cou

18、ld/would/might+動(dòng)詞原形→表將來(lái)。 I wish he were with us at this special moment. 我希望這個(gè)特殊時(shí)刻他和我們?cè)谝黄稹? How I wish I had followed my parents' advice. 我多么希望聽(tīng)了父母的建議。 She wished she would be admitted to Beijing University this year.她希望今年能被北大錄取。 (2)用于表示要求、命令、建議、意圖、決定、推薦等意義的動(dòng)詞:suggest, advise, propose, mand, re

19、quest, insist, remend等后接賓語(yǔ)從句時(shí),從句謂語(yǔ)動(dòng)詞為(should+)動(dòng)詞原形。 He demanded that he (should) be told everything. 他要求將一切告訴他。 【點(diǎn)津】 當(dāng)suggest表示“暗示,表明”,insist表示“堅(jiān)持認(rèn)為,堅(jiān)持說(shuō)”時(shí),從句要用陳述語(yǔ)氣。 Jane's pale face suggested that she was ill and we suggested that she (should) have a medical examination. 簡(jiǎn)蒼白的臉色表明她病了,我們建議她做一下醫(yī)學(xué)檢查。

20、 (3)would rather后的賓語(yǔ)從句,謂語(yǔ)用一般過(guò)去時(shí)表現(xiàn)在或?qū)?lái)要做的事情,用過(guò)去完成時(shí)表示過(guò)去的動(dòng)作。 I'd rather that you came tomorrow. 我寧愿你明天來(lái)。 I'd rather that you had e yesterday. 你昨天來(lái)了該有多好。 2.用于主語(yǔ)從句、表語(yǔ)從句和同位語(yǔ)從句中 (1)表示要求、命令、建議、意圖、決定、推薦等意義的動(dòng)詞,構(gòu)成it is +動(dòng)詞的過(guò)去分詞+ that ...時(shí),that從句中的謂語(yǔ)動(dòng)詞用(should+)動(dòng)詞原形。 It is advised that the meeting (sh

21、ould) be put off until next week.有人建議會(huì)議推遲到下周舉行。 (2)表示要求、命令、建議、意圖、決定、推薦等意義的名詞,如suggestion,proposal,advice,order,request等后面的表語(yǔ)從句和同位語(yǔ)從句中,謂語(yǔ)動(dòng)詞用(should+)動(dòng)詞原形。 My request is that you (should) make an apology to your teacher. 我的要求是你要向你的老師道歉。 We all agreed to his suggestion that we (should) go out for

22、picnic.我們都同意他的建議去野餐。 3.用于定語(yǔ)從句中 It's (high/about) time (that) ...句型中,從句的謂語(yǔ)動(dòng)詞用一般過(guò)去時(shí)或should+動(dòng)詞原形(其中should不可省略),句意為“確實(shí)到了……的時(shí)候了”。 It is high time that we took some measures to solve the problem. 確實(shí)到了我們?cè)摬扇〈胧┙鉀Q問(wèn)題的時(shí)候了。 4.用于as if引導(dǎo)的從句中 表示與現(xiàn)在事實(shí)相反用一般過(guò)去時(shí);表示與過(guò)去事實(shí)相反用過(guò)去完成時(shí)。 People treat him as if he were a

23、 dangerous person.人們把他看作是一個(gè)危險(xiǎn)人物。 He talks as if he had been to many countries. 他說(shuō)起話來(lái)好像他去過(guò)好多國(guó)家似的。 5.用于if only引導(dǎo)的感嘆句中,其用法相當(dāng)于wish后的賓語(yǔ)從句。 He failed in the exam again. If only he had worked harder. 他考試又失敗了。要是他早努力些就好了。 (對(duì)應(yīng)學(xué)生用書(shū)第255頁(yè)) Ⅰ.從下面方框中選擇恰當(dāng)?shù)那閼B(tài)動(dòng)詞填空 shall,must,can,could,may,would,ought to,

24、might,should1.________ you get a good result in your experiment! 2.________ you rather live in a town,or in the country? 3.________ we go to the new restaurant to have dinner? 4.You ________ leave your key at the reception desk. 5.A puter can't think itself.It ________ be told what to do. 6.The

25、 question es down to whether we ________ act upon his advice. 7.Hurry up!He ________ be waiting for us anxiously right now. 8.My MP5 has disappeared.Who ________ have taken it? 9.—Where is Bob? —He ________ be in the living room,but I am not sure. 10.You ________ not have told her the terrible

26、news.She is very upset right now. 11.They are playing basketball;they ________ have finished their homework. 12.I saw him just now so he ________ not have gone abroad. 13.It's surprising that such a gentleman ________ be so rude to the old. 14.—May I watch TV after supper? —No,you ________. 15

27、.You look tired,so you ________ as well go and have a rest. 【答案】 1.May 2.Would 3.Shall 4.may/can 5.must 6.ought to/should 7.must 8.can/could 9.may/might/could 10.should 11.must 12.could 13.should 14.mustn't 15.may/might Ⅱ.根據(jù)所提供的情景,用適當(dāng)?shù)那閼B(tài)動(dòng)詞完成句子 1.Marie called me up last night but I didn't hear i

28、t.I ________________________ asleep. 2.I can manage the shopping alone.You ________(not) e with me. 3.May be you ________ apologize to her,for she is sobbing bitterly in her room. 4.I am afraid of darkness and I ________________(not) go out alone at night. 5.The solider paid for the seat,when he

29、 ________________ entered free. 6.You ________ never be careful enough when you cross the road. 7.Even if he has time,he ________ go shopping in town on Sunday. 8.—How old are you,madam? —If you ________ know,I'm twice my son's age. 9.—Tom must have lost his way,for he hasn't arrived yet. —No,

30、he ________________ lost his way.He has got a map with him. 10.I promise you ________ have the money as soon as I get it. 11.It's nearly time for class to start.The teacher ________ be here soon. 12.When she was a little girl,she ________ sit by the window every evening,deep in thought. 13.We __

31、______________ received the letter yesterday,but it didn't arrive. 14.I really regretted wasting the hours when I ________________ studied hard,but it was too late. 15.Your home is not far from your school,so you ________________ left in such a hurry. 【答案】 1.must have been 2.needn't 3.should 4.da

32、re not 5.could have 6.can 7.won't 8.must 9.can't/couldn't have 10.shall 11.should 12.would 13.should have 14.should have 15.needn't have Ⅲ.根據(jù)漢語(yǔ)提示,用句末括號(hào)內(nèi)的英語(yǔ)單詞完成句子 1.要是他按照醫(yī)生要求的那樣靜靜地躺著,他現(xiàn)在就不那么受罪了。 If he had lain quietly as the doctor instructed,he ________________________ so much now.(suffer) 2.現(xiàn)

33、在已經(jīng)12點(diǎn)了,難道你不認(rèn)為我們?cè)摶丶伊藛幔? It's already 12 o'clock now.Don't you think it's about time we ________________?(go) 3.我昨天得了重感冒,否則,我就會(huì)完成作業(yè)了。 I had a bad cold yesterday,otherwise I ________________________ my homework.(finish) 4.要不是因?yàn)橛⒄Z(yǔ)考試,我上周日就會(huì)去聽(tīng)音樂(lè)會(huì)。 But for the English examination,I ___________________

34、_____ to the concert last Sunday.(go) 5.要不是因?yàn)樗粫?huì)唱歌,我就邀請(qǐng)她參加聚會(huì)了。 If it ________________________ the fact that she can't sing,I would invite her to the party.(be) 6.即使太陽(yáng)從西邊升起,我對(duì)你的愛(ài)也不會(huì)變。 If the sun were to rise in the west,my love for you ________________________.(change) 7.仔細(xì)檢查后,Michel的醫(yī)生堅(jiān)持認(rèn)為他傷得很重

35、,堅(jiān)決要求他立刻動(dòng)手術(shù)。 After careful examination,Michel's doctor insisted that he ________ badly wounded and that he ________________________________ at once.(operate) 8.如果不是空氣吸收了太陽(yáng)的部分熱量,夜晚地球會(huì)非常冷,不適合我們居住。 Without the air to hold some of the sun's heat,the earth at night ________________________________ for

36、 us to live.(too) 9.我寧愿你明天去買(mǎi)書(shū)。 I would rather you ________________________________ tomorrow.(go) 10.他談起話來(lái)好像他已經(jīng)知道了這個(gè)秘密。 He talked as if he ________________ the secret.(know) 【答案】 1.would not suffer 2.went home 3.would have finished 4.would have gone 5.were not for 6.would not change 7.was;should be operated on 8.would be too cold 9.went to buy books 10.had known

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