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第三讲情态动词和虚拟语气情态动词的基本用法全析考法 单句语法填空/单句改错1(2018北京高考)In todays information age, the loss of data _ cause serious problems for a pany. 解析：can句意：在如今的信息化时代，丢失数据可能会给一个公司造成严重的问题。can在此表示客观可能性，意为“可能会，有时候会”。2(2016全国卷)Truly elegant chopsticks might _ (make) of gold and silver with Chinese characters.解析： be made根据语境可知，筷子是被制造的。此处为含有情态动词的被动语态might be done。3(2015四川高考改编)You _ be careful with the camera.It costs!解析：must句意：你必须要小心使用这个相机。它很贵重！ 根据后面的“It costs！”可知，此处是说话人对使用相机的人提出的要求，must意为“必须”，表示说话人主观上的要求，语气强烈。4(2018全国卷)As a kid, I loved to watch cartoons, but no matter how many times I asked to watch them, my parents would not to let me._解析：去掉let前的to情态动词would表示“意愿”时后面直接接动词原形。5(2016全国卷)We can chose between staying at home and taking a trip._解析：chosechoose情态动词can后面接动词原形。chose是choose的过去式形式。谨记规则(一)can, could用法例句表示能力，意为“能，会”；could表示过去的能力。She can speak French fluently. 她能讲一口流利的法语。can可用于肯定句中，表示客观或理论上的可能性。An experienced teacher can make mistakes. 一位有经验的老师也会犯错。表示请求或允许。在疑问句中，could可以代替can，语气更委婉，肯定回答时要用can，不用could。Can/Could I use your bike tomorrow morning？Yes, you can. 明天上午我可以用你的自行车吗？是的，可以。表示说话者的主观推测，意为“可能”，用于否定句和疑问句中。can比could语气强。He cant be our manager. He has gone to Beijing. 他不可能是我们经理。他已经去北京了。表示惊异、怀疑、迷惑等态度，常用于否定句和疑问句中。How can you treat me like that？你怎么能那样对我？用于固定习语中：cant . too/enough (无论也不过分；越越好)；cant but do sth. (不得不，只好)；cant help doing sth. (禁不住做某事)。I cant thank you too much for all your help to my son while we were away from home.我非常感谢你，在我们不在家时帮助我的儿子。One cannot but admire her determination.人们不得不佩服她的决心。(二)may, might用法例句表示请求或许可。在疑问句中，might可以代替may，语气更加委婉。给予许可时用may，不用might。Might I ask for a picture of your little daughter？Yes, you may我可以要一张你小女儿的照片吗？是的，可以。表示推测，意为“或许，可能”，通常用于肯定句和否定句中。might比may语气弱。I really dont like James. Why did you invite him？Dont worry. He might not e. 我真的不喜欢詹姆斯。你为什么邀请他？别担心。他或许不会来。表示祝愿，常用结构为：May主语动词原形！May you be happy every day！愿你快乐每一天！用于固定短语中：may/might as well动词原形(不妨，还是为好)；may/might well动词原形(很可能)。You may/might as well tell him the truth.你不妨告诉他事实吧。He may/might well stay in Beijing now.他现在很可能待在北京。(三)must, have to用法例句表示义务，意为“必须”。must强调说话人的主观看法，have to则强调客观需要；在回答带有must的问句时，否定式常用need not (neednt)或dont have to，而不是用must not。We must act as quickly as possible now. Just tell us whether you can undertake the task or not.现在我们必须尽快采取行动。你仅仅告诉我们你能否承担这项任务就行。I have to go now, because my mother is in hospital.我现在不得不走了，因为我母亲在住院。must用来表示推测，意为“一定”，只能用在肯定句中。must的肯定程度比can强。You must be hungry after a long walk. 长途跋涉之后，你一定饿了。must表示“偏要，非要不可”。常用于疑问句和条件句中，偶尔也用于陈述句中。If you must go, at least wait until the storm is over. 如果你非要走，至少要等到暴风雨停了。mustnt表示禁止，意为“不得，不允许；一定不要”。You mustnt play with the knife, or you may hurt yourself.你千万不要玩刀，否则会伤到自己的。(四)shall用法例句用于第一、三人称的疑问句中，表示说话者征求对方的意见。Shall he e in now？要不要让他现在进来？用于第二、三人称的陈述句中，表示说话者的命令、警告、威胁、允诺、决心等。You shall be punished for what you have done.你必须为你的所作所为受到惩罚。用于条约、规定、法令、法律等文件中表示义务规定，意为“必须”。One of our rules is that every student shall wear school uniform while at school. 我们有一条规定，那就是每名学生在校期间都必须穿校服。(五)should, ought to用法例句should表示责任、义务、劝告、建议等，意为“应该”。We should be strict with ourselves.我们应该严格要求自己。should表示出乎意料、惊讶的口气，意为“竟然，居然”。Such a gentleman should do that.这样一位绅士竟然会做那种事。ought to表示义务、责任、劝告等，意为“应该”，语气比should略重。You ought not to be so selfish. 你不应该这么自私。should和ought to表示推测，指合乎理想的情况或结果，意为“按说应该”。Try phoning Robert he should be home by now. 给罗伯特打个电话试试，他现在应该到家了。(六)will, would用法例句与各种人称连用，用于陈述句中，表示主语的意志、意愿或决心。will指现在，would指过去。I will never talk to him again. 我再也不会和他说话了。表示征求意见或提出请求，多用于第二人称疑问句中。would比will语气委婉。Will/Would you please close the window？请把窗户关上好吗？表示习惯性动作、固有属性或必然趋势，意为“总是；习惯于”。will指现在，would指过去。Fish will die without water.没有水，鱼会死的。(七)need, dare用法例句need既可作情态动词，也可作实义动词；作情态动词时，表示“需要”，常用于否定句、疑问句和条件句中。neednt表示“不必”；对need引出的一般疑问句作肯定回答时用must而不用need，作否定回答时用neednt。I neednt use a clock to wake me up, because at six oclock each morning the train es by my house. 我不必用闹钟来叫醒自己，因为每天早上六点都有火车从我家旁边经过。dare既可作情态动词，也可作实义动词；作情态动词时，表示“敢，敢于”，后跟动词原形，常用于疑问句、否定句和条件句中。I am so afraid that I dare not move. 我吓得一动也不敢动。情态动词have done全析考法单句语法填空/单句改错1(2018天津高考改编)I cant find my purse. I could _ (leave) it in the supermarket yesterday, but Im not sure.解析：have left句意：我找不到我的钱包了。我昨天可能把它落在超市里了，但我不确定。根据句中的时间状语yesterday可知空格处是对过去发生事情的推测，需用“情态动词have done”。2(2013全国卷改编)Since nobody gave him any help, he _ have done the research on his own.解析：must句意：既然没有人帮助他，他一定是独自完成了这项研究。根据题干中“Since nobody gave him any help”可判断设空处表示肯定的推测。3(2013浙江高考改编)I _ (enjoy) myself more it was a perfect day.解析：couldnt/cant have enjoyed句意：我玩得再开心不过了这是完美的一天。“cant/couldnt . more”表示最高级的意思；根据题干中的was可知设空处表示“对过去发生的事情的态度”，故答案为couldnt/cant have enjoyed。4(2015天津高考改编)I neednt worried before I came to the new school, for my classmates here are very friendly to me._解析：worried前加haveneednt have done表示“本没有必要做”。谨记规则1对过去发生的事情或状态进行推测must have done sth.“(过去)一定做了某事”；语气比较肯定；用于肯定句may (might) have done sth.“(过去)可能/也许做了某事”；语气不确定；用于肯定句和否定句can (could) have done sth.“本来能够/可以做某事”；用于否定句和疑问句，表示对过去发生的行为的怀疑或不确定It must have rained last night, for the road is quite muddy.昨晚一定下雨了，因为路很泥泞。The boy might have known the truth, but I am not quite sure.那个男孩也许知道了真相，但我不是很确定。I didnt see her in the meeting room this morning. She couldnt have spoken at the meeting.我今天上午没在会议室看见她，她不可能在会议上讲话。2表示“与过去事实相反”could have done sth.过去本可以做某事但实际上没做neednt have done sth.过去本不必做某事但实际上做了ought to/should have done sth.过去本应该做某事但实际上没做oughtnt to/shouldnt have done sth.过去本不应该做某事但实际上做了might have done sth.过去可能做某事但实际上没做You could have done better, but you didnt try your best.你本可以做得更好，但是你没有尽力而为。I neednt have taken the umbrella, for the weather is fine.天气这么好，我本没必要带雨伞的。You ought to have done this exercise more carefully.你本应该更仔细地做这个练习。You might have given him more help, though you were busy.你本可以给他更多帮助，虽然你当时很忙。虚拟语气全析考法单句语法填空/单句改错1(2018北京高考改编)They might have found a better hotel if they _ (drive) a few more kilometers. 解析：had driven句意：如果他们开车再多走几千米的话，他们或许就会找到一家更好的旅馆。主从句皆为对过去的虚拟，从句中应使用过去完成时表示对过去的虚拟。2(2018天津高考改编)If we _ (catch) the flight yesterday, we would be enjoying our holiday on the beach now. 解析：had caught句意：如果昨天我们赶上了航班的话，我们现在正在海滩上享受我们的假期了。此句是错综时间虚拟语气，由yesterday可知从句是对过去的虚拟(用过去完成时)，主句是对现在的虚拟。3(2018江苏高考改编)Its strange that he _have taken the books without the owners permission. 解析：should句意：真奇怪，他居然没有得到主人的允许就把那些书拿走了。在it is strange that .; it is important that .; it is necessary that .等句式中，that 引导的从句要用“should动词原形”作谓语。4(2018江苏高考改编)There is a good social life in the village, and I wish I _ (have) a second chance to bee more involved. 解析：had句意：在这个村子里有很好的社交生活，并且我希望我能再有一次机会更多地参与其中。动词wish后面的宾语从句要用虚拟语气。若表示与现在相反的虚拟，从句用一般过去时； 若表示与过去相反的虚拟，从句用过去完成时或would/could have done。根据句意可知，此处表示与现在的情况相反，故用动词的过去式。5(2016全国卷)Some classmates suggest we can go to places of interest nearby._解析：canshould或去掉cansuggest在此处表示“建议”，后面接宾语从句时，从句中谓语用“should动词原形”，should可以省略。6(2015四川高考)If you are me, would you talk to them？_解析：arewere根据语境可知，此处是虚拟语气，表示对现在的虚拟，动词用过去式，所以要把are改为were。谨记规则(一)虚拟条件句的基本用法1if虚拟条件句(1)基本构成时间if从句谓语动词形式主句谓语动词形式对现在的虚拟过去式(be的过去式用were)should/would/could/might动词原形对过去的虚拟had过去分词should/would/could/mighthave过去分词对将来的虚拟should动词原形should/would/could/might动词原形过去式(be的过去式用were)were to动词原形(2)错综时间虚拟条件句当从句、主句所表示的行为发生的时间不一致时，动词的形式要根据它所在的时间作出相应的调整。If you hadnt left home without a word, your parents wouldnt be so worried now.要不是你一言不语地离开家，你父母现在就不会那么担心了。(从句与过去事实相反，主句与现在事实相反)(3)省略if的倒装句if虚拟条件状语从句中出现were, had, should时，可省略if，把were, had, should提到句首，变为倒装句式。Had he caught the morning train, he would not have been late for the meeting.要是他赶上了早晨的火车，那他就不会开会迟到了。2含蓄条件句(1)有时假设的情况不用条件句表达，而是用but for, without等介词(短语)或上下文来表示。We wouldnt have finished the project on time without your timely help.如果没有你的及时帮助，我们就不能按时完成那项工程了。(2)用连词otherwise, or等暗示后文与前面的情况相反，从而引出后文的虚拟语气。I was ill that day. Otherwise, I would have taken part in the sports meeting.我那天病了，否则，我就参加运动会了。(3)虚拟条件通过but暗示出来，模式为“虚拟情况but真实情况”。I would have delivered a speech, but I had a cold that day.我本来可以演讲的，但是那天我感冒了。(二)虚拟语气在名词性从句中的用法1主语从句中的虚拟语气(1)某些It is/was形容词/过去分词/名词that引导的主语从句中，主语从句要用虚拟语气，即“should动词原形”，should可省略。Its vital that we (should) take our safety driving along the road seriously.重要的是我们应该认真对待我们的安全驾驶。(2)用于本句型常见的形容词、过去分词、名词形容词necessary, important, best, right, impossible, preferable, desirable, advisable, essential, urgent, strange等。过去分词通常表示提议、要求、命令等，如suggested, required, requested, demanded, urged, decided, proposed, ordered, desired, advised等。名词pity, regret, desire, rule, shame, honour, surprise等。2宾语从句中的虚拟语气(1)宾语从句在表示“提议”“要求”“命令”“意志”等动词后，其谓语动词用“(should)动词原形”表示虚拟。常见的此类动词有insist (坚持要求，坚决主张), order, mand, advice, suggest (建议), propose, remend, ask, demand, require, request, urge, arrange, desire, intend, direct等。He suggested that we (should) start off early the next day.他建议我们第二天早点出发。易错提醒当suggest表示“暗示，表明”之意，insist表示“坚持说，坚持认为”之意时，suggest/insist后的宾语从句不使用虚拟语气，而使用陈述语气。The smile on his face suggested that he was satisfied with our work.他脸上的微笑表明他对我们的工作很满意。The man insisted that he had never stolen the money.那个人坚持说他从没有偷过那笔钱。(2)wish后接that引导的宾语从句用虚拟语气，其谓语动词的形式为：时间从句谓语动词形式对现在的虚拟过去式(be的过去式用were)对过去的虚拟had过去分词对将来的虚拟would/could/might动词原形I wish (that) I were ten years younger.但愿我能年轻十岁。I wish (that) I had met that film star yesterday.我多希望昨天见到了那个电影明星。(3)would rather后接宾语从句用虚拟语气，其谓语动词的形式为：时间从句谓语动词形式对现在的虚拟过去式(be的过去式用were)对将来的虚拟对过去的虚拟had过去分词,Id rather he had gone to the seaside with me the day before yesterday.要是他前天和我去海边就好了。3表语从句中的虚拟语气(1)句子主语是表示“愿望”“劝告”“建议”“主张”“命令”“决定”等行为动词派生出来的同根名词时，其表语从句常用虚拟语气“(should)动词原形”结构。这类名词有suggestion, proposal, request, advice, decision, requirement等。Our only request is that this (should) be settled as soon as possible.我们唯一的要求是这事应该尽可能快地解决。(2)虚拟语气可用于as if, as though引导的表语从句和方式状语从句：时间从句谓语动词形式对现在的虚拟过去式(be的过去式用were)对过去的虚拟had过去分词对将来的虚拟would/could/might动词原形She looks as if nothing had happened to her.她看起来好像什么事都没有发生似的。He opened his mouth as if he would say something.他张开嘴好像要说什么。特别注意如果从句中描述的事情可能会发生，那么从句中的谓语动词可用陈述语气。It sounds as if it is raining.听起来像是在下雨。4同位语从句中的虚拟语气当表示建议、提议、命令、要求等的名词作主语或宾语时，其同位语从句中的谓语动词用“should动词原形”，should可以省略。常见的这类名词有：advice建议decision决定demand要求desire渴望 idea想法 motion提议order命令 plan计划 proposal提议request要求 suggestion建议We agreed to the order that the task (should) be pleted at 5 oclock.我们都同意这个命令：五点完成这项任务。52个特定句式中的虚拟语气(1)if only引导的条件句及感叹句对过去的虚拟对现在的虚拟对将来的虚拟had过去分词过去式(be的过去式用were)would/could/should/might动词原形(2)It is (high/about/(very) time (that).从句中谓语动词用过去式或“should动词原形”。If only I had seen the film.要是我看过那部电影就好了。It is high time that we should start/started out.我们该出发了。语法填空解题“2注意”1若句中谓语动词为原形，在其前设纯空格题时，注意考虑情态动词。然后根据句意或句式结构填入恰当的情态动词。2一旦判断所给动词在句中作谓语，就要考虑其时态、语态、语气、主谓一致等，特别是注意虚拟语气中的时态。判断虚拟语气，除了常见的if虚拟条件句，还应注意其他常搭配虚拟语气的标志词， 如suggest, would rather, as if, wish, otherwise, or, but for等。据第1条解题1You can never be too careful while driving. You know, many traffic accidents result from carelessness.2Youve made lots of mistakes in the exam, many of which could have been avoided had you been more careful.3As the new manager is kind and patient, there should be no trouble in his getting on well with the workers.4Smoking is not allowed here, sir. Go to the smoking room over there, if you must.5Who is playing the piano?It must be Kate. No one else in our school can play it so beautifully.据第2条解题6It is required by law that a driving test (should)be_taken (take) before a man gets a license.7He telephoned to inform me of your birthday, or I would_have_known (know) nothing about it.8The national smog serves as a constant reminder, indicating that its high time we reflected (reflect) on ourselves.9It would_be (be) cool if I won this contest. I dont think Im good enough, though.Give it a shot. You never know.10The Antarctica is so mystically described by some people. If only I had_been (be) there before.短文改错解题“2视角”1看句中情态动词是否运用正确；2看是否考查虚拟语气。若是考查虚拟语气，注意分清主句与从句中的时态关系以及不同句式中的虚拟语气构成形式。据第1条解题1Life is unpredictable; even the poorest may to bee the richest.去掉to2I love the weekend, because I neednt to get up early on Saturdays and Sundays.去掉to3We neednt bought so much food now that Suzie wont be with us for dinner.bought前加have据第2条解题4One day, a friend of mine, Tom, contacted me and suggested that we started to swim.startedstart5In the past two years, you have helped us a lot, without which we couldnt have been made such great progress in English.去掉been6However, its high time that immediate measures must be taken.mustshould
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