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備戰(zhàn)2019年高考英語(yǔ) 糾錯(cuò)筆記系列 專題09 情態(tài)動(dòng)詞和虛擬語(yǔ)氣(含解析)

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備戰(zhàn)2019年高考英語(yǔ) 糾錯(cuò)筆記系列 專題09 情態(tài)動(dòng)詞和虛擬語(yǔ)氣(含解析)

專題09 情態(tài)動(dòng)詞和虛擬語(yǔ)氣易錯(cuò)點(diǎn)1 情態(tài)動(dòng)詞的誤用 1. Some people who dont like to talk much are not necessarily shy; they _ just be quiet people. A. must B. may C. should D. would【錯(cuò)因分析】考生容易誤選C項(xiàng),認(rèn)為是一定是,實(shí)際上這里表示可能性。【參考答案】Bmay/might接動(dòng)詞原形時(shí)表示對(duì)現(xiàn)在情況的推測(cè),意思是可能。She thought it might be wise to try her luck here. 她認(rèn)為在這兒碰碰運(yùn)氣也許不錯(cuò)。2. What does the sign over there read? No person _ smoke or carry a lighted cigarette, cigar or pipe in this area. A. will B. may C. shall D. must【錯(cuò)因分析】考生容易誤選A項(xiàng),認(rèn)為這里要用will表示將來(lái)或意愿。shall在本句中用于第三人稱,表示警告和禁止;will表示現(xiàn)在的意志、愿望等,意為要,希望;may表示許可,或用于請(qǐng)求許可,意為可,可以;must意為必須,要,應(yīng)當(dāng)?!驹囶}解析】句意:那邊的那個(gè)標(biāo)志說(shuō)的什么?任何人都不準(zhǔn)在這個(gè)區(qū)域吸煙、或攜帶點(diǎn)著的香煙、雪茄或煙斗。根據(jù)語(yǔ)境可知這里表示警告和禁止,因此要用should?!緟⒖即鸢浮緾shall用作情態(tài)動(dòng)詞主要有以下兩個(gè)用法:(1)用于第一、三人稱的疑問(wèn)句,表示征求對(duì)方意見(jiàn)。Shall I help you? 要不要我?guī)湍??Shall I open the window? 要我把窗子打開(kāi)嗎?Shall she go to the concert with us this evening? 她要和我們一起去音樂(lè)會(huì)嗎?(2)用于陳述句中表示允諾、告誡、警告、威脅、命令、規(guī)定、必然性等(可用于各類人稱)。You shall suffer for this. 你會(huì)為此事吃苦頭的。(表威脅)Each competitor shall wear a number. 每個(gè)參賽者要戴一個(gè)號(hào)碼。(表規(guī)定)You shall hear everything as soon as you come. 你一來(lái)就可以聽(tīng)到所有的情況。(表允諾)You shall go to the front at once. 你馬上到前線去。(表命令)Dont worry. You shall get the answer this very afternoon. 不要著急,你今天下午晚些時(shí)候可以得到答案。(表允諾)He shall be sorry one day. I tell you. 我告訴你,他早晚會(huì)后悔的。(表警告)Nothing shall stop us from fighting against pollution. 什么也阻止不了我們與污染作斗爭(zhēng)。(表決心)1.【2018·北京卷·單項(xiàng)填空】In todays information age, the loss of data _ cause serious problems for a company.A. need B. should C. can D. must【答案】C2. I think the work _ be completed ahead of time. 【解析】句意:我認(rèn)為這項(xiàng)工作可以提前完成。由句意可知這里表示說(shuō)話人的一種看法,故填can?!敬鸢浮縞an【名師點(diǎn)睛】此題有些考生可能會(huì)認(rèn)為這里是要求工作必須提前完成而誤填must,因此在做此類題時(shí),一定要結(jié)合語(yǔ)境,仔細(xì)推敲語(yǔ)境暗含的意思,從而提高做題的正確率。3. Its the office! So you _ know eating is not allowed here. Oh, sorry. A. must B. will C. may D. need【答案】A【名師點(diǎn)睛】must常用來(lái)表示禁止、命令,這時(shí)主要用于否定句中。You must not speak ill of others. 你一定不要說(shuō)別人的壞話。You must not go there. 你不準(zhǔn)去那兒。情態(tài)動(dòng)詞的基本用法(一)情態(tài)動(dòng)詞的特點(diǎn)情態(tài)動(dòng)詞,在英文中主要用來(lái)表示說(shuō)話人的看法、態(tài)度等。它很接近中文里的能愿動(dòng)詞。從用法上來(lái)說(shuō),它有這樣幾個(gè)特點(diǎn):1. 各個(gè)情態(tài)動(dòng)詞自身都有一定的詞義。2. 情態(tài)動(dòng)詞不能在句中獨(dú)立擔(dān)當(dāng)謂語(yǔ)。3. 情態(tài)動(dòng)詞在句中不受任何人稱、性、數(shù)變化的影響。4. 情態(tài)動(dòng)詞后接的不定式(除ought外)都不帶to,即接動(dòng)詞原形。(二)常用情態(tài)動(dòng)詞的基本用法英文中的情態(tài)動(dòng)詞主要有:can, could; may, might; must; ought; need; dare, dared,另外,shall, will, should, would在一定的場(chǎng)合也可用作情態(tài)動(dòng)詞。He can speak five languages. 他會(huì)說(shuō)五種語(yǔ)言。She must have arrived home by now. 現(xiàn)在她準(zhǔn)到家了。We should study hard for our motherland. 我們應(yīng)該為祖國(guó)而努力學(xué)習(xí)。They neednt be in such a hurry for there is enough time for them. 他們還有足夠的時(shí)間,用不著這么慌張。1. can, could 能,會(huì)could可以看作是can的過(guò)去式,這兩個(gè)詞除了時(shí)態(tài)不相同外,在表達(dá)意思的許多方面是相同的。當(dāng)然could也有自己獨(dú)特的用法。(1)表示腦力或體力上的能力Nobody can stop the development of science. 誰(shuí)也無(wú)法阻止科學(xué)的發(fā)展。She can sing that song in English.她能用英文唱那歌。He can submerge to a depth of about twenty meters. 他能潛入約二十米深的水中。He could hardly support his family before he found the new job.他在找到那份新工作前幾乎無(wú)法養(yǎng)家。I could not understand the lecture on the computer given by Mr. Smith.我聽(tīng)不懂史密斯先生作的那個(gè)關(guān)于計(jì)算機(jī)的講座。(2)表示客觀上的可能性You can borrow this useful book from the library.你可以從圖書(shū)館借到這種有用的書(shū)。A more suitable person than him for the job cannot be found. 不可能找到比他更適合這份工作的人了。Now people can skate on the lake. 現(xiàn)在人們可以在湖上滑冰了。When the storm stopped, the plane could take off. 當(dāng)風(fēng)暴停下來(lái)時(shí),飛機(jī)可以起飛了。(3)表示主觀上的允許Can I ask you some questions about it? 我可以問(wèn)你有關(guān)這件事的幾個(gè)問(wèn)題嗎?You cannot leave here till I come back. 直到我回來(lái)你才能離開(kāi)。Such kind of thing cant happen anymore later. 這類事以后不準(zhǔn)再發(fā)生了。Can you tell me how to get to the airport? 你能告訴我怎么去機(jī)場(chǎng)嗎?Could you tell me how to get to the airport? 您能告訴我怎么去機(jī)場(chǎng)嗎?Could I be forgiven my negligence? 請(qǐng)?jiān)徫业氖韬?,行嗎??)表示猜測(cè)、懷疑或驚詫(用于否定句、疑問(wèn)句或感嘆句中)How can / could you be here? 你怎么會(huì)在這兒?She couldnt / cant be so stupid to do that. 她不可能蠢得去做那種事吧。He couldnt / cant be over seventy. 他不可能有七十多歲了。Where could / can the boy be now? 那孩子現(xiàn)在能在哪兒呢?另外,could還常用于表示較客氣委婉的看法、提問(wèn)及用于虛擬語(yǔ)氣的結(jié)構(gòu)中。這時(shí)候,could就不可以看作是can的過(guò)去式了。而是could自己獨(dú)特的用法。Could you speak a little slowly? 您能稍微說(shuō)慢一點(diǎn)兒?jiǎn)??I could come earlier if asked. 如果要讓我早一點(diǎn)來(lái),我可以來(lái)早一點(diǎn)。Im afraid that we couldnt give you any definite answer at this moment.恐怕我們這時(shí)候還無(wú)法給予你任何確切的答復(fù)。We would appreciate it if you could offer us any help.如果您能為我們提供幫助的話,我們將不甚感激。You could have done better if you had worked harder at it.如果你再加把勁,你本來(lái)可以做得更好一些的。2. may, might 或許,可能,可以might可以看作是may的過(guò)去式,這兩個(gè)詞除了時(shí)態(tài)不相同外,在表達(dá)意思的許多方面是相近的。當(dāng)然may 和might又都有一些各自不同的獨(dú)特用法。(1)可能性I may be busy from tomorrow on. 從明天起我可能會(huì)忙起來(lái)。I wondered if they might agree with the idea. 我想知道他們是否會(huì)同意這種想法。She thought it might be wise to try her luck here. 她認(rèn)為在這兒碰碰運(yùn)氣也不錯(cuò)。You may catch sight of the sunrise from here when you get up before 5 in the morning.你在早晨五點(diǎn)鐘以前起來(lái),或許能從這兒看到日出。(2)表示允許May I come in? 我可以進(jìn)來(lái)嗎?Id like to have a smoke here if I may. 如果可以的話我想在這兒抽一支煙。The librarian told her that she might return the book to the library in three days.圖書(shū)館理員告訴她說(shuō),她可以在三天后還那本書(shū)。At the press conference, a news reporter asked the chairman if she might trouble him with a question about Taiwan issue. 在記者招待會(huì)上,一位新聞?dòng)浾邌?wèn)大會(huì)主席她是否能提一個(gè)有關(guān)臺(tái)灣問(wèn)題方面的問(wèn)題。(3)may可以用來(lái)表示祝愿,也常用于表示目的或讓步的狀語(yǔ)從句中:May that day come soon. 但愿那天早日到來(lái)。May you succeed in winning the first prize in the game. 祝愿你比賽奪冠成功。May you continue in your efforts and achieve greater successes. 祝愿你繼續(xù)努力并取得更大的成功。(4)might也常用于表示目的等狀語(yǔ)從句中,或用于虛擬語(yǔ)氣的結(jié)構(gòu)中:I could not convince him, try as I might. 我無(wú)論用什么樣的辦法也不能說(shuō)服他。He died so that the others might live. 為了其他的人能活下去,他自己犧牲了。One error in calculation might ruin the whole project. 計(jì)算中出一點(diǎn)錯(cuò)就可能毀掉整個(gè)工程。They left off earlier on that day so that they might catch the first train.那天,他們?yōu)榱粟s上頭班車動(dòng)身早一些。If you had made better use of your time, you might have learned more.假若你將自己的時(shí)間利用得更好一些,你本可以學(xué)到更多東西的。 注意:在回答以may引導(dǎo)的問(wèn)句時(shí),一般說(shuō)來(lái)避免使用may,以免顯得太嚴(yán)厲、或不太客氣,而改用其他方式。May I come in? 我可以進(jìn)來(lái)嗎?Yes, please. / Sure. / Certainly. 請(qǐng)進(jìn)。Please dont. 請(qǐng)不要進(jìn)來(lái)。No , you mustnt. 不行。3. must 應(yīng)該,必須,一定(1)表示出于職責(zé)、義務(wù)該做某事We must protect peoples rights. 我們應(yīng)該保護(hù)人民的利益。Everyone must be loyal to his motherland. 每個(gè)人都應(yīng)該忠于自己的祖國(guó)。You must serve the people when you grow up. 你們長(zhǎng)大成人后應(yīng)該服務(wù)于人民。Students must work hard at their study. 學(xué)生應(yīng)該努力學(xué)習(xí)。(2)表示出于主觀意識(shí)而必須要做某事We must speed up the pace of our economic reform. 我們必須加速經(jīng)濟(jì)改革的步伐。We must keep steps to the scientific development. 我們一定要與科學(xué)的發(fā)展保持步調(diào)一致。You must hurry up or youll be late. 你必須得快點(diǎn)兒,不然會(huì)遲到的。 注意:在這種用法中must表示出于主觀意識(shí)而必須要做某事;have to卻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(shí)態(tài)的變化形式。I have to go now for Ive got a meeting 15 minutes later.我現(xiàn)在必須要走了,因?yàn)槲?5分鐘后有個(gè)會(huì)要開(kāi)。He has to be back home by five to fetch his son from kindergarten.他必須在五點(diǎn)鐘前回家去幼兒園接他的兒子。Jenny had to tidy up the room before her mother came back.珍尼不得不在她媽媽回家以前將房間整理好。 注意:在這種用法中,回答以must引導(dǎo)的問(wèn)句時(shí),若是否定答復(fù),不可以用mustnt 而需要用neednt 或是dont have to,因?yàn)閙ustnt意思是絕不能、一定不要,而沒(méi)有不必的意思。Must we hand in our exercises today? 我們今天必須交作業(yè)嗎?Yes, you must. 是的,必須交。No, you neednt(or, you dont have to ). 不,不必今天交。(3)表示禁止(用于否定句)You must not speak ill of others. 你一定不要說(shuō)別人的壞話。Cars must not park here. 這里禁止停車。Smoking must not allow in the office. 嚴(yán)禁在辦公室吸煙。You mustnt talk to girls like that. 你絕不能那樣對(duì)女孩子說(shuō)話。(4)表示猜測(cè)、推測(cè),must常用于肯定句中表示猜測(cè)。對(duì)現(xiàn)在或未來(lái)的事進(jìn)行猜測(cè)時(shí),后接動(dòng)詞原形;對(duì)已經(jīng)發(fā)生的事進(jìn)行猜測(cè)時(shí),后接have + 過(guò)去分詞。You must be tired after working so long. 你工作這么長(zhǎng)時(shí)間,肯定累了吧。It must be that naughty boy crying outside. 肯定是那個(gè)調(diào)皮的孩子在外面大叫。It must have rained last night for it is so wet outside. 外面這么濕,昨晚肯定下雨了。The idea must be accepted by the society sooner or later.這種想法肯定遲早會(huì)被社會(huì)所接受的。I didnt see you in class yesterday. You must have been absent.我昨天上課沒(méi)見(jiàn)著你,你肯定沒(méi)有來(lái)。4. ought 應(yīng)該(后接帶to的不定式構(gòu)成謂語(yǔ)動(dòng)詞)(1)表示出于職責(zé)、義務(wù)該做某事You ought not to be so careless in your work. 你不應(yīng)該在工作上如此粗心大意。We ought to study hard for the sake of our motherland. 我們應(yīng)該為了我們的祖國(guó)而努力學(xué)習(xí)。His doctor said to him that he oughtnt to smoke so much. 他的醫(yī)生說(shuō)他不應(yīng)該抽這么多煙。Oughtnt you to give us a chance to try? 你難道不應(yīng)該給我們一個(gè)嘗試的機(jī)會(huì)嗎?(2)表示極有可能發(fā)生某事As an auto repairman, Dick ought to know what is wrong with the car.作為一個(gè)汽車修理工,狄克應(yīng)該知道這部車的毛病所在。If we set off right now, we ought to be able to get there in time.如果我們馬上出發(fā),我們應(yīng)當(dāng)能夠按時(shí)到達(dá)那里。Tomorrow ought to be a nice day for we have such a fine sunset today.今天有這么好的晚霞,明天準(zhǔn)是個(gè)晴天。5. need需要(用于否定句和疑問(wèn)句)There are still one and a half hours to go, we neednt be in such a hurry.還有一個(gè)半小時(shí),我們無(wú)需如此慌張。I hardly need say how much we missed you. 不用說(shuō)我們是多么地想念你。Need you go so soon? 你需要這么早就去嗎?You need have no anxiety on my account. 你不必為我而著急。6. dare, dared敢(用于否定句、疑問(wèn)句和疑問(wèn)句)Dare you stay here alone in the night? 你敢在夜里待在這兒?jiǎn)幔縉obody dared mention that matter. 沒(méi)有人敢提那件事。How dared you say that to her? 你怎么敢對(duì)她說(shuō)那件事?Even if you dare do it, I wont allow you to because its too dangerous.即使你敢做,我也會(huì)讓你做那件事,因?yàn)樘kU(xiǎn)了 7. shall用作情態(tài)動(dòng)詞時(shí),適用于第二人稱和第三人稱。主要表示下面幾層意思:(1)許諾You shall hear everything directly you come. 你一來(lái)就可以聽(tīng)到一切了。Whatever you want you shall have, said the Fairy. 仙女說(shuō):你想得到什么,你就可以有什么。I dont want to be hard on your daughter; she shant be pressed.我不想對(duì)你女兒太嚴(yán)厲,她不會(huì)受壓制。I promise that you shall see her again before long.我保證你不久就能再見(jiàn)到她。(2)命令You shall come to my office immediately. 你必須馬上來(lái)我的辦公室。She shall not stay in my garden. 她不可以待在我的花園里。He shall not come into my study. 不許他進(jìn)我的書(shū)房。You shall do as you are told. 按告訴你的那么做。(3)決心(表示某事一定會(huì)發(fā)生)That day shall come. 那一天一定會(huì)到來(lái)。It has been decided that he shall be given the job. 已經(jīng)決定讓他做那份工作了。This law shall come into effect on January 1st 2001. 這個(gè)法律于2001年1月1日生效。(4)規(guī)定Each competitor shall wear a number. 每個(gè)參賽者要佩戴一個(gè)數(shù)字標(biāo)。The renter shall keep the house in a neat and orderly state. 租賃者要保持房屋整潔有序。The supplier shall make shipment before October and the purchaser shall make payment within 15 days afterreceipt of the goods. 賣方十月以前裝運(yùn),買方在收到貨物后十五天內(nèi)付款。8. should用作情態(tài)動(dòng)詞時(shí),有時(shí)表示具體的意思,有時(shí)沒(méi)有意義。主要用于下面幾個(gè)方面:(1)表示出于職責(zé)、義務(wù)該做某事You shouldnt come to such a decision hastily. 你不應(yīng)該匆忙做出這么一個(gè)決定。You should write to your parents at least once a month. 你應(yīng)該至少每月給你父母親寫一封信。We should read English aloud every morning. 我們應(yīng)該每天早晨朗讀英文。They should do it for their own good. 為了他們自己利益他們應(yīng)該做這件事。(2)表示對(duì)某種情況的估計(jì)She shouldnt be out in such an early morning. 她不會(huì)這么一大早就出去了吧。This book should be published in two months at most. 這本書(shū)最多兩個(gè)月后就會(huì)出版的。The effect of the tax should be felt in higher prices.人們可能會(huì)從各種上漲的物價(jià)中感覺(jué)到這種稅的影響的。The event should lead them to a even worse economic crisis.這次事件可能會(huì)將他們引向更嚴(yán)重的經(jīng)濟(jì)危機(jī)。(3)表示驚訝、失望等情緒I think it is dreadful that anyone should be so miserable. 我認(rèn)為,竟然每個(gè)人都如此傷心就太糟糕了。Why should I pay him for nothing? 我干嗎要白白付給他錢?It seems so unfair that this should happen to me. 這件事竟然發(fā)生在我身上,似乎太不公平了。Its strange that it should be so cold today. 奇怪,今天怎么會(huì)這么冷。(4)用于某些從句中表示虛擬語(yǔ)氣The doctor insisted that the girl should be hospitalized. 大夫堅(jiān)持認(rèn)為那個(gè)女孩要住院治療。She stood away so that he should enter the room first. 她讓到一邊,好讓他第一個(gè)進(jìn)入房間。Ill write it down lest I should forget it. 我將它記下以免遺忘。Take an umbrella with you in case it should rain. 帶上雨傘,以防下雨。9. will, wouldwould可以看作是will的過(guò)去式,這兩個(gè)詞除了時(shí)態(tài)不相同外,在表達(dá)意思的許多方面是相近的。當(dāng)然will 和would又都有一些各自不同的獨(dú)特用法。(1)用于第二人稱疑問(wèn)句,表示請(qǐng)求(在這種用法中would使語(yǔ)氣更為客氣、委婉)Will you tell her that Ill be back in twenty minutes? 請(qǐng)告訴她我二十分鐘后回來(lái),好嗎?If you want help, just let me know, will you? 你需要幫助就告訴我,好嗎?Would you tell me how to get to the shopping center? 您能告訴我怎么去購(gòu)物中心嗎?Wont you come in and have a little whisky?你要不要進(jìn)來(lái)喝一點(diǎn)兒威士忌?(或是:你進(jìn)來(lái)喝一點(diǎn)兒威士忌,好嗎?)(2)用于表示愿望Go where you will. 去你想去的地方吧。I will pay you at the rate you ask. 我會(huì)按你要的利率付給你錢的。He wouldnt let the doctor take his blood pressure. 他不愿意讓大夫給他量血壓。They had to obey whether they would or not. 不管他們?cè)敢馀c否,他們必須要遵從。(3)表示習(xí)慣、傾向(可譯成總是會(huì)、老是,等 )Sometimes the cat will lie there all afternoon. 有時(shí)侯,那只貓會(huì)整個(gè)下午都躺在那兒。Oil and water will not mix. 油和水不能混合。He would sit there for hours, doing nothing at all. 他總是在那兒一坐就是幾個(gè)小時(shí),什么都不干。(4)表示猜測(cè)(可譯成一定是、想必,等 )This will be the house youre looking for. 這想必就是你要找的房子吧。He will have gone back to New Zealand. 他一定是回新西蘭去了。That would be in 1999, I think. 那大概是在1999年吧。(5)will用于表示決心(可譯成一定要,決心等 )We will never talk about that subject again. 我們決不會(huì)再談?wù)撨@個(gè)話題了。I will make this computer work even if I have to stay up all night.我即使整晚不睡覺(jué)也一定要讓這臺(tái)計(jì)算機(jī)工作起來(lái)。(6)would常用于虛擬條件句,表示與事實(shí)相反或不太可能實(shí)現(xiàn)的情況But for your help we would have been late. 要不是你幫忙我們就遲到了。Well, I wouldnt worry about it. It wont do me any good.好了,我不會(huì)擔(dān)心那件事的,因?yàn)樗粫?huì)給我?guī)?lái)什么好處。易錯(cuò)點(diǎn)2 混淆情態(tài)動(dòng)詞+have done各種句式的不同含義1. Where is my dictionary? I remember I put it here yesterday. You _ it in the wrong place. A.must put B.should have put C.might put D.might have put【錯(cuò)因分析】考生容易誤選A項(xiàng),原因是受漢語(yǔ)表達(dá)習(xí)慣的影響,認(rèn)為你一定是把它放錯(cuò)地方了。根據(jù)前面的語(yǔ)境可判斷出,本題考查情態(tài)動(dòng)詞表推測(cè)的用法。所以要用might have done。should have done表示(過(guò)去)本來(lái)應(yīng)該做某事。must意為一定,是肯定的推測(cè),與所提供的情景矛盾。might put表示現(xiàn)在發(fā)生的事?!緟⒖即鸢浮緿情態(tài)動(dòng)詞have done用法must have done一定做過(guò)某事,其否定形式為cant/couldnt have donecan/could have done本來(lái)能夠做某事但卻未做可能做過(guò)某事cant/couldnt have done不可能做過(guò)某事may/might have done或許/可能做過(guò)某事should/ought to have done本該做但卻未做,其否定形式表示本不該做但卻做了neednt have done做了本沒(méi)有必要做的事情1.【2018·天津卷·單項(xiàng)填空】 I can't find my purse. I_ it in the supermarket yesterday, but I'm not sure.A. should leave B. must have leftC. might leave D. could have left【答案】D2.That car nearly hit me; I _. A. might be killed C. may be killed B. might have been killed D. may been killed【解析】句意:那輛小轎車差點(diǎn)撞到了我,我差點(diǎn)被撞死。被撞死是過(guò)去可能發(fā)生而實(shí)際并沒(méi)有發(fā)生的事情,因此要用might have been killed?!敬鸢浮緽【名師點(diǎn)睛】may/might have + 過(guò)去分詞表示對(duì)過(guò)去已經(jīng)發(fā)生的事進(jìn)行推測(cè)判斷,一般只用于肯定句或否定句中(疑問(wèn)句中用can或could),may/might的意思是可能,也許,may/might的意思是可能不(沒(méi)有)。Nobody stopped him; he might have been a passengers child. 沒(méi)人制止他,他或許是一個(gè)旅客的孩子。Its no use going to his house. He may not have gone home; he may have gone somewhere else. 去他家沒(méi)有用,他可能沒(méi)有回家,可能去別的地方了。注意:might have + 過(guò)去分詞可用來(lái)表示過(guò)去可能發(fā)生而沒(méi)有發(fā)生的事情。You were so careless that day. You might have made a bad mistake. 那天你太粗心了,你有可能犯錯(cuò)誤的。(事實(shí)上并沒(méi)有犯錯(cuò))1.must have done表示對(duì)過(guò)去事情的肯定推測(cè),譯成一定做過(guò)某事,該結(jié)構(gòu)只用于肯定句。 It must have rained last night, for the ground is wet. 昨晚一定下雨了,因?yàn)榈孛孢€是濕的。You must have been mad to speak to the servant. 你和仆人說(shuō)話,一定是發(fā)瘋了。2.cant have done表示對(duì)過(guò)去事情的否定推測(cè),譯成不可能做過(guò)某事。Mr Smith cant have gone to Beijing, for I saw him in the library just now. 史密斯先生不可能去北京了,我剛才還在圖書(shū)館見(jiàn)過(guò)他。Mary cant have stolen your money. She has gone home. 瑪麗不可能偷你的錢,她回家去了。3.can have done表示對(duì)過(guò)去行為的懷疑,用于疑問(wèn)句,譯成可能做過(guò)嗎?。There is no light in the room. Can they have gone out? 屋里沒(méi)有燈,他們可能出去了嗎?There is nowhere to find them. Where can they have gone? 到處找不到他們,他們可能到什么地方去呢?4.could have done是虛擬語(yǔ)氣,表示對(duì)過(guò)去事情的假設(shè),意思是本來(lái)能夠做某事而沒(méi)有做。He could have passed the exam, but he was too careless. 本來(lái)他能夠通過(guò)考試,但是他太粗心。5.may have done表示對(duì)發(fā)生過(guò)的事情的推測(cè),意思是可能已經(jīng)或也許已經(jīng),用于肯定句中。 What has happened to George? 喬治發(fā)生了什么事?I dont know. He may have got lost. 我不知道,他可能迷路了。6.might have done表示對(duì)過(guò)去事情的推測(cè),might與may意思相同,但可能性更小。多用于虛擬語(yǔ)氣結(jié)構(gòu)中。 She might have achieved greater progress, if you had given her more chances. 如果你多給她點(diǎn)機(jī)會(huì),她可能已經(jīng)取得了更大的成績(jī)。7.would have done虛擬語(yǔ)氣,表示對(duì)過(guò)去事情的假設(shè),意思是本來(lái)會(huì)。I would have told you all about the boys story, but you didnt ask me. 我本來(lái)會(huì)告訴你這個(gè)小男孩的故事,但是你沒(méi)有問(wèn)我。8.should have done意思是本來(lái)應(yīng)該做某事,而實(shí)際沒(méi)做。shouldnt+have+done表示本來(lái)不應(yīng)該做某事,而實(shí)際做了。含有指責(zé)對(duì)方或自責(zé)的含義。Tom, you are too lazy. The work should have been finished yesterday. 湯姆,你太懶惰了,這項(xiàng)工作本來(lái)應(yīng)該昨天就做完的。Look, Tom is crying. I shouldnt have been so harsh on him. 看,湯姆哭了,我本不應(yīng)該對(duì)他如此嚴(yán)厲的。9.ought to have done表示過(guò)去應(yīng)該做而實(shí)際并沒(méi)有做,譯成理應(yīng)做,往往表示遺憾。與should have done用法基本一樣。 I ought to have gone home last Sunday. 我理應(yīng)上星期日回家。You ought not to have given him more help. 你不應(yīng)該幫助他那么多。10.need have done表示本來(lái)需要做某事而實(shí)際沒(méi)有做。neednt have done則表示本來(lái)不需要做某事而實(shí)際做了I neednt have bought so much wine only five people came. 我本來(lái)沒(méi)有必要買這么多酒,只來(lái)了五個(gè)人。He need have hurried to the station. In that case, he wouldnt have missed the train. 他本來(lái)需要快點(diǎn)去車站的,那樣的話,他就不會(huì)誤了火車。易錯(cuò)點(diǎn)3 虛擬語(yǔ)氣時(shí)態(tài)的誤用1. I _ through that bitter period without your generous help.【錯(cuò)因分析】此題考生容易誤認(rèn)為空格處表示現(xiàn)在的情況,用would+動(dòng)詞原形,從而填成了wouldnt go,實(shí)際上這是對(duì)過(guò)去的假設(shè)?!驹囶}解析】句意:如果沒(méi)有你的慷慨幫助我不能度過(guò)那段艱難的時(shí)期。度過(guò)那段艱難的時(shí)期是過(guò)去發(fā)生的事情,因此這里是對(duì)過(guò)去發(fā)生的事情的假設(shè),又因這里表示否定意義,因此要用couldnt have done?!緟⒖即鸢浮縞ouldnt have gone 虛擬語(yǔ)氣中,主句用would / might / could + 動(dòng)詞原形表示現(xiàn)在或?qū)?lái)的情況,用would / might / could + have + 過(guò)去分詞表示過(guò)去的情況。1.【2018·北京卷·單項(xiàng)填空】They might have found a better hotel if they _ a few more kilometers.A. drove B. would drive C. were to drive D. had driven【答案】D2. But for their help, we _ the program in time. A. cannot finish B. will not finish C. had not finished D. could not have finished【試題解析】句意:要不是他們的幫助,我們不會(huì)按時(shí)完成這個(gè)項(xiàng)目??忌菀渍`選C項(xiàng),原因是沒(méi)有注意到but for their help這一含蓄條件。由語(yǔ)境可知,這里表示與過(guò)去的事實(shí)相反,所以主句應(yīng)該用would /could / might / should + have done結(jié)構(gòu)?!敬鸢浮緿【名師點(diǎn)睛】(1)有些句子中,沒(méi)有任何表示虛擬語(yǔ)氣的詞、短語(yǔ)或從句,但仍要用虛擬語(yǔ)氣。這時(shí),要么是省略了表示虛擬語(yǔ)氣的部分,要么是隱含在上下文之中。We would have made a lot of money. 我們本來(lái)能夠掙很多錢的。(2)用介詞代替條件狀語(yǔ)從句。常見(jiàn)的介詞有:with,without,but for等。But for the rain (=If it had not been for the rain), we would have finished the work. 要不是下雨,我們就完成這項(xiàng)工作了。Without electricity (=If there were no electricity), life would be quite different today. 如果沒(méi)有電,今天的生活就會(huì)是另一個(gè)樣子。(3)用but,otherwise,or else等由真實(shí)語(yǔ)氣轉(zhuǎn)化為虛擬語(yǔ)氣或反之。The captain kept calm in the terrible storm, otherwise the accident wouldnt have been prevented. 船長(zhǎng)在可怕的大風(fēng)暴中顯得很鎮(zhèn)靜,否則一場(chǎng)事故不可避免。3. It is hard for me to imagine what I would be doing today if I _ in love, at the age of seven, with the Melinda Cox Library in my hometown. A. wouldnt have fallen B. had not fallen C. should fall D. were to fall【答案】B【名師點(diǎn)睛】錯(cuò)綜條件句就是虛擬條件主句和從句的動(dòng)作發(fā)生的時(shí)間不一致,因此,主句和從句的謂語(yǔ)動(dòng)詞要根據(jù)各自所指的不同時(shí)間選擇適當(dāng)?shù)膭?dòng)詞形式。If I were you, I would not have missed the film last night. 如果我是你,我不會(huì)錯(cuò)過(guò)昨晚的電影。If they had started in the early morning, they would arrive in half an hour. 如果他們清早就出發(fā),那么再有半個(gè)小時(shí)就到了。時(shí)態(tài)類型主句謂語(yǔ)形式條件句的謂語(yǔ)形式例句與現(xiàn)在事實(shí)相反would / should / could / might + 動(dòng)詞原形動(dòng)詞過(guò)去式did *be 多用wereIf I were you, I should study English. I would certainly go if I had time.與過(guò)去事實(shí)相反would / should / could / might + have done動(dòng)詞過(guò)去完成式 had doneIf you had taken my advice, you would not have failed in the test.If I had left a little earlier, I would have caught the train.與將來(lái)事實(shí)相反would / should / could / might + 動(dòng)詞原形動(dòng)詞過(guò)去式 If you came tomorrow, we would have the meeting. If it were to rain tomorrow, the meeting would be put off.should + 動(dòng)詞原形 were + to do注意:1. would/should/could/might主句謂語(yǔ)中的should主要用于第一人稱;would表示結(jié)果還表示過(guò)去經(jīng)常做某事,might表示可能性,could表示能力、允許或可能性。比較: If you tried again, you would succeed. 要是你再試一試,你就會(huì)成功的。 (would表結(jié)果) If you tried again, you might succeed. 要是你再試一試,你可能會(huì)成功的。 (might表可能) If you tried again, you could succeed. 要是你再試一試,你就能成功了。(could表能力) 2. 錯(cuò)綜時(shí)間虛擬條件句 即條件從句與主句所指時(shí)間不一致,如從句指過(guò)去,而主句即指的是現(xiàn)在或?qū)?lái),此時(shí)應(yīng)根據(jù)具體的語(yǔ)境情況,結(jié)合上面提到的三種基本類型對(duì)時(shí)態(tài)作相應(yīng)的調(diào)整: If it had rained last night, the ground would be wet now. 要是昨晚下過(guò)雨的話,現(xiàn)在地面就會(huì)是濕的。You would be much better now if you had taken my advice. 假若你當(dāng)時(shí)聽(tīng)我的話,你現(xiàn)在就會(huì)好多了。 3. If虛擬條件句的否定(含蓄條件句) ??純蓚€(gè)句型:If it werent for.和If it hadnt been for.,其意為若不是(有) 要不是。If it werent for water, no plant could grow. 要是沒(méi)有水植物就無(wú)法生長(zhǎng)。 If it hadnt been for your assistance, we wouldnt have succeeded.=But for your assistance, we wouldnt have succeeded.=Without your assistance, we wouldnt have succeeded.要是沒(méi)有你的支持,我們不會(huì)成功的。4. If虛擬條件句的倒裝形式,即把were,had,should置于句首。Were I in school again (= If I were in school again), I would study harder. 如果我再上學(xué),我一定更加努力地學(xué)習(xí)。Had you asked me, I would have told you.=If you had asked me, I would have told you.要是你問(wèn)我的話,我就告訴你了。易錯(cuò)點(diǎn)4 忽視名詞性從句中虛擬語(yǔ)氣的用法1. The doctor recommended that you _ swim after eating a large meal. A. wouldnt B. couldnt C. neednt D. shouldnt【錯(cuò)因分析】考生容易誤選B項(xiàng),原因是不知道recommend的賓語(yǔ)從句中要用虛擬語(yǔ)氣?!緟⒖即鸢浮緿2. It is important that we _. A. shall c

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