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should,might,could,would的区别
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would,could,should,might,这4个词可以互换吗?请区别性的造句
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在现在时态句里,用情态动词(Modal Verb)的过去时态
(could,might,should,would)表示说话人的谦虚、客气、有礼、委婉等：基本可互换,但might很少用1. Would you be kind enough to show me the way to the post office.
(情态动词 would,表示客气有礼)2. It would be better for you not to stay up too late.(表示委婉)/c?word=would%2Ccould%2Cshould%2Cmight&url=http%3A//flc%2Ezjgsu%2Eedu%2Ecn/englishonline/ksfd/gcss/Grammar/subjunctive%2Dmood%2Easp&b=14&a=1&user=baidu拟语气是英文中一特殊的语言现象,主要用于表达与事实相反的陈述,常表达强烈愿望、遗憾、感慨、后悔、责备、规劝等语义,可大致分为三类 一、对现在事实的虚拟基本形式：If + were /did等过去式…, …would /could /should /might + do例如：If I were a bird, I would fly to the moon. (事实上,I'm not a bird, so I will not fly to the moon.)If she knew who you are, she would go out of joy. (事实上,She doesn't know, so she still feels joyous.)I would certainly go if I had the time. How nice it would be if you could stay a bit longer. 二、对过去事实的虚拟基本形式：If + had done…, …would /could / should /might + have done例如：If she had been warned earlier, she wouldn't have broken the rules. (事实上：She was not warned earlier and she broke the rules.)If it hadn't rained, the match would have seemed more fascinating. (事实上：It rained and the match was less fascinating.)She would have come if we had invited her. 此种虚拟可进行倒装,如：Had the letter been sent out, it would have ruined our friendship.= If the letter had been sent out, it would have ruined our friendship.三、对将来事实的虚拟基本形式：If + should do…, …would /could /should /might + were+to+v（可能性极小）,意思类似汉语中的"万一"例如：If he should forget the date, I might teach him a good lesson. (事实上：他不大可能忘记那个日期)If it should snow this afternoon, we could make a snowman. (事实上不大可能会下雪)此种虚拟可倒装,如：Should my car fail, I would have to return home on foot.= If my car should fail, I would have to return home on foot.如果条件从句中包含有were, had, should或could,有时可把if省略掉,但这时要把were, had, should或could放在主语前面（这种结构在口语中较少使用）.例如：1）Had we made (= If we had made ) adequate preparations, we might have succeeded.2）Were there no gravity, there would be no air around us.3）Should it rain tomorrow, the meeting would be put off.2．用在含蓄条件句中句子中,假设的情况不用条件从句表示出来,而是用一个介词短语来表示,句子的谓语形式也可遵循表7的规则.这种用法也常见于or, or else, otherwise和but后面的分句中.例如：1）Without music, the world would be a dull place.2）But for your help, we would have failed.3）She would have gone with us, but she didn’t have time.4）He must have had an accident, or he would have been here then.3．用在错综时间条件句中有时候,条件从句表示的动作和主句表示的动作发生的时间并不一致,这时,谓语动词的形式要根据表示的时间来调整,这种句子可称作错综时间条件句.例如：1）If you hadn’t watched television so late, you wouldn’t be so sleepy now.（此句为时间交错的虚拟条件句,从句表示与过去事实相反的假设,主句则假设与现在情况相反）2）If you were in better health, we would have allowed you to join them in the work.（从句表示与现在事实相反的假设,主句则表示一种与过去事实相反的设想）4．用在wish后的宾语从句中这种句子主要表示愿望,that常省略.若指现在或将来的愿望,从句用过去时；若指过去没有实现的愿望,从句用过去完成时.例如：1）I wish I had learned to play chess.（与过去事实相反）2）I wish I remembered his address.（与现在事实相反）3）I wish he would try again.（对将来情况的假设）若wish 后的宾语从句中用would,可以表示请求,通常意味着说话人的不快或不满.例如：1）I wish you would help us.2）I wish you would stop asking such silly questions.5．用在if only感叹句中当表示“但愿”,“要是…就好”时,它的用法和wish基本相同,只是更富有感情色彩,表示一时很难实现的愿望.例如：1）If only I knew what you wanted.2）If only you hadn’t told him what I said, everything would have been all right.6．用在以as if (as though) 引出的方式状语从句中当表示过去想象中的动作或情况时,用过去完成时；当表示和现在事实相反或对现在情况有所怀疑时,用一般过去时.例如：1）The old couple loved the orphan girl as if she had been their daughter.2）It seems as if it were spring.7．用在某些虚拟的定语从句中例1：He was the very person I should have been wished to see.例2：It’s (high) time that we went to class.9．用以表示说话人的主观愿望或选择,仅用在一些惯用句型的从句中例1：I’d rather they came tomorrow.例2：He’d rather I went to Fuzhou by sea.例3：I’d just as soon you didn’t watch television this evening.但had rather, would rather, would just as soon, would sooner等惯用语如用在简单句中,其后都用不加to的动词不定式.例如：1）I’d rather die than give up my principle.2）I’d just as soon (would sooner) resign than take part in such dishonest deals.二、用固定的情态动词表示的虚拟语气1. should +动词原形（有时省略should）（1）用在动词如advise, command, demand, desire, insist, order, propose, recommend, request, require, suggest, urge等后的宾语从句中.例如：1）They requested that we (should) send a delegation to their country.2）She urged that he write and accept the post.（2）用在it is suggested, it is desired, it is required, it was ordered, it was proposed, it has been decided, it is necessary (essential, imperative, important, desirable) that等引出的主语从句中.例如：1）It is desired that we (should) get everything ready by tonight.2）It is necessary that the teacher (should) have a thorough knowledge of the subject he teaches.（3）用在suggestion, motion, proposal, order, recommendation, plan, idea, requirement等引起的表语从句和同位语从句例如：He put his coat over the child lest he should catch cold.4．用在表示比拟的方式状语从句中例如：They talked as if they had been friends for years.5．用在表示虚拟情况的定语从句中例如：It is high time you handed in your test paper.6．用在某些表示主观愿望的名词从句中例1：I wish I were as strong as you.例2：He insisted that we (should) take up the matter at the meeting.7．用在婉转的请求、建议、批评等句子中例1：Could you spare me a few minutes?例2：You might have told me earlier.例3：Hadn’t you better go and see you dentist about that tooth?8．用在表示祝愿的简单句中例1：Long live world peace.例2：May you succeed.
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虚拟语气中could,might,should,would的用法,有何区别?什么时候能替代
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can 可以(表示被允许)、能够(表示能力上的).could意思和can一样,是can的过去时.另外,用于Could you please.的句型,表示建议别人做某事.shall 1.将要,一般将来时,用于主语是第一人称的时候 I sh
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Could表示能够而should表示应该语气较为强烈Might是指推测可能性较弱是不太可能发生的事would纯属表示一种意愿如果替换要看具体情况谢谢
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can,could,may,might,will,would的区别请问上述词的用法、例句、区别,互换时的场合（一直不太会用上面词的情态语气,有时还能互换）谢谢!另外还有can have done,could have done,may have done,might have done,这四个结构怎么使用?感觉好像不只是could是can的过去时那么简单,最好有例句,
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解答情态动词表示猜测的试题时,一要清楚被猜测的时间,二要清楚有无客观事实根据.若有客观事实根据,则无论是肯定还是否定的猜测,猜测语气最强且符合时间要求的为最佳答案;情态动词表示猜测时语气从强到弱的顺序是:must,will,would,ought to,should,can,may,could,might.若无客观事实根据,纯凭主观臆断,则猜测语气最弱且符合时间要求的为最佳答案.如: 1.I thought you __________ like something to read,so I have brought you some books.(MET 1986) A.may B.might C.could D.must 由题意可知被猜测的时间是(过去)将来,没有客观事实根据,猜测语气要求最弱,所以正确选项是B. 2.Peter __________ come with us tonight,but he isn't sure yet.(MET 1993) A.must B.may C.can D.will 由题意可知被猜测的时间是将来,没有客观事实根据,猜测语气要求最弱,所以正确选项是B. 3.It __________ last night,for the ground was wet this morning. A.must have rained B.may have rained C.must rain D.might rain 由题意可知被猜测的时间是过去,有客观事实根据the ground was wet,猜测语气要求最强,所以正确选项是A. 4.Mary __________ be in Paris,for I saw her in the town only a few minutes ago.(MET 1994) A.mustn't B.can't C.shouldn't D.may not 由题意可知被猜测的时间是现在,有客观事实根据I saw her in the town a few minutes ago,猜测语气要求最强,所以正确选项是B(can't是m ust的否定式). 5?—There were already five people in the car but they managed to take me as well. —It __________ a comfortable journey.(NMET 1995) A.can't be B.shouldn't be C.mustn't have been D.couldn't have been 由题意可知被猜测的时间是过去,有客观事实根据there were already five people...take me as well,猜测语气要求最强,所以正确选项是D. 6.—When can I come for the photos I need them tomorrow afternoon. —They __________ be ready by 12:00.(NMET 1998) A.can B.should C.might D.need 由题意可知被猜测的时间是将来,有客观事实根据need them tomorrow afternoon,猜测语气要求最强,所以正确选项是B. 7.—Are you coming to Jeff's Party —I'm not sure.I __________ go to the concert instead.(NMET 2000) A.must B.would C.might D.should 由题意可知被猜测的时间是将来,没有客观事实根据,猜测语气要求最弱,所以正确选项是C. 情态动词的推测性用法 用适当的情态动词表示讲话者对客观事物的主观看法,这就是情态动词的推测性用法.常用来表示推测的情态动词有 might,may,must,can.might,may,must表示的可能性程度由弱变强,must表示"一定", can则一般用于疑问句或否定句中.例如: 1.They must be talking about us on the radio right now. 此刻,他们一定在电台里谈论我们的情况. 2.She may have missed her train. 她可能没有赶上火车. 3.I don't know why he is late,he might have had an accident. 我不知道他为何迟到,可能遇上了事故. 4.Where can John have put the matches He can't have thrown them away. 约翰会把火柴放在哪儿呢 他不可能把火柴扔掉的. 5.That can't be the postman,it's only seven o'clock. 才七点钟,不可能是邮递员. 表示推测的情态动词后的动词不定式可用完成式,进行式和一般式三种.用完成式表示对过去情况的推测.例如: 6.Her father thought that she must have met a fairy. 她父亲认为她一定碰上了仙女. 7.They must have studied English for years. 他们学习英语肯定有几年了. 8.You may have left your glasses at the office. 你可能把眼镜忘在办公室了. 用进行式则表示对正在发生的动作的推测.例如: 9.He might be reading a newspaper now. 他可能正在看报纸. 10.He can't be working at this hour. 这个时候他肯定不会在工作. 推测性情态动词后用不定式的一般式有两种情况:如果不定式是状态动词,则表示对现在状态的推测.如果不定式是动作动词,则表示对将来动作的推测.例如: 11.Mary must have some problem ,she keeps crying. 玛丽不停地哭,一定有了麻烦. 12.I saw that the camel must be blind in the right eye. 我知道这只骆驼右眼肯定瞎了. 13.Our team must win the game. =I'm sure that our team will win the game. 我们队肯定能赢这场比赛. 14.It might rain this evening. =It's possi- ble that it will rain this evening. 今天傍晚天可能要下雨. 上述表明,推测性情态动词是以现在(讲话时)为基础,对过去,现在,将来的动作或状态的推测.因此,在构成陈述部分含有推测性情态动词的反意疑问句时,要注意反意疑问句中动词的不同形式.例如: 15.The boy must have thought John was mad,didn't he 那孩子肯定以为约翰疯了,是吗 16.Our teacher must have looked through our papers,hasn't he 老师一定批完了我们的试卷,是吗 17.She must be playing basketball,isn't she 她一定在打篮球,是吗 选择下列各句的正确答案. 1.Hurry up,our teacher _____ for us at the school gate. A.must be waiting B.must wait C.might waiting D.can be waiting 2.She doesn't answer the doorbell,she _____ be asleep. A.might to B.might C.must have D.should 3."What has happened to George ""I don't know,he _____ lost." A.can have got B.may have got C.might get D.could get 4.Mr Li _____ be in Beijing because I saw him in town only a few minutes ago. A.needn't B.can't C.shouldn't D.mustn't 5.We can't blame John for the mistake.He wasn't here when we decided what to do.So _____ he about the plan. A.wasn't B.was known C.can't be known D.couldn't have known 6.My ballpen is nowhere to be found,I _____ while I was playing football. A.must drop it B.should have dropped it C.must have dropped it D.had dropped 7.It _____ be Li Ming who took my dictionary away.It be Zhang Hua who did it. A.can't;must B.mustn't;must C.needn't;can D.can 8.TheIt _____ rained heavily last night. A.should B.should have C.must D.must have 9.Tom must have learned Chinese for several years, _____ he A.mustn't B.hasn't C.didn't D.don't 10.Mr Wang must be at home now, _____ he A.mustn't B.doesn't C.isn't D.wasn't 11.She must have left for Shanghai, _____ she A.mustn't B.hasn't C.didn't D.doesn't Key:1.A2.B3.B4.B5.D6.C7.A 8.D 9.B 10.C 11.C 1) must/may/might + have done 表对过去动作、事实、状态推测 FOR EXAMPLE： He must have arrived already. 他一定已经到了. They may have seen him. 他们可能见到过他. They might not have considered me as their friend. 或许他们没把我当成他们的朋友. You might have let me known before! 你要是早点让我知道就好了. It was really very dangerous. You might have injured him. 真是很悬.你有可能把他打伤了. If I had been less cautious I might have seen more wise. 如果我不那么谨慎,或许反倒聪明点. 2. could/can + have done 表埋怨,能做的没做 could/can not + have done 表不能做的做了 FOR EXAMPLE, You can have given me the book earlier. 你本来可以早点把书给我的. You can not have forgotten me. 你不可能已忘记我了. Indications are that the accident could have been prevented. 迹象表明,本来这次事故是可以避免的. 3.should/ought to + have done 表埋怨,该做的未做 should/ought not to + have done 表不该做的做了 FOR EXAMPLE, He shouldn't have come to school at 9:00 am. 他不该早上9：00来上学. He ought to have done the work himself. 这个工作他是应该自己做的. They oughtn't to have let you out of hospital so soon. 他们不应当让你这么早出院. 肯定的+have done表示本应该做而实际上没做,否定的+have done表示本不应该做而实际上做了
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may和might的区别
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may是情态动词,过去式might,因为宾语从句时态跟随主句,要求过去式.所以只能might；以后你还学到,虚拟语气也只能might.the pine trees were black _____the moring sky A.over B.against C.for D.under //against表示“衬托出”（树林在早上的天空中显得格外地黑,有点这个味道） I would like to have a car _____ my own one day A.for B.to c.with d.of 固定用法,have sth of one's onw（某人的东西=sb's own sth）
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may和might都表可能，只是might语气弱点。might是may过去式另外may和might的区别就简单一点. 大致上可以归纳为might比may要不确定(至于may可以用在虚拟语气里面我就不打算再详细讲了). He may be at home. She might have gone shopping. 这两句话其实就是说话者对自己猜测的...
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