考研英语虚拟语气的三种用法

考研英语虚拟语气的三种用法

虚拟语气用来表示说话人的主观愿望或假想，而不表示客观存在的事实，所说的是一个条件，不一定是事实，或与事实相反。虚拟语气通过谓语动词的特殊形式来表示。在表示虚假的、与事实相反的或难以实现的情况时用虚拟语气，表示主观愿望或某种强烈情感时，也用虚拟语气。即当一个人说话时欲强调其所说的话是基于自己的主观想法，愿望，假想，猜测，怀疑或建议，而不是根据客观实际，就用虚拟语气。

下面，专家们就为广大的2013年的考生们详细地分析一下虚拟语气的三种用法，以供大家参考。

一、虚拟语气在状语从句中的运用

虚拟语气在状语从句中的运用除了可以表示条件外，还可以表示比较、结果、目的等。虚拟语气用于表示条件的状语从句中，一般称为虚拟条件句。根据时间的不同，虚拟条件句中谓语动词时态的变化可能有三种形式，即现在、过去和将来。

If it did，it would open up its diversity program，now focused narrowly on race and gender，and look for reporters who differ broadly

by outlook，values，education，and class.(2001年TEXT1)

这是一个含有条件状语从句的复合句。If it did是条件状语从句。主句中主语是it;谓语动词有两个，分别是would open up.。.和look for.。

这是一个与现在事实相反的虚拟语气，从句用一般过去时，主句用would+动词原形open up和look for。

参考译文：如果它能注意这个问题的话，它就会拓展其雇员多样化项目，而目前的项目只单纯考虑招收不同种族和性别的员工，去雇佣那些在世界观、价值观、教育背景及社会阶层方面各不相同的记者。

二、虚拟语气在名词性从句中的运用

虚拟语气除了用作状语从句中外，还可以用作主语从句、宾语从句、表语从句、同位语从句等名词性从中。

第一，虚拟语气在主语从句中的运用

当it作形式主语，后面用形容词作表语，即在it is + adj.这样的句型中，当描述主语的表语形容词是advisable，critical，crucial，desirable，essential，imperative，important，incredible，inevitable，necessary，recommend，strange，urgent等形容词时，主语从句的谓语动词多用虚拟语气，如果是现在时，谓语动词用should/would +动词原形(should/would经常省略);如果是过去时，则用should/would + have done的形式。

It was inevitable that this primacy should have narrowed as other countries grew richer. Just as inevitably，the retreat from predominance proved painful.

这是一个含有主语从句的复合句。句首的It是形式主语，真正主语是that从句，该主语从句使用了虚拟语气should+完成时。(2000年TEXT1)参考译文：随着其他国家日益富裕，美国的这一优势地位逐渐下降是不可避免的。惟其不可避免，从优势地位上退出愈发痛苦不堪。

第二，虚拟语气在宾语从句中的运用

表示“建议、请求、命令、要求”等主观意向的词(如：suggest、advise、assume、decide、demand、desire、insist、propose、order、recommend、require、suggest……)，引导宾语从句

时需用虚拟语气。虚拟语气中的格式很固定：谓语动词用should+动词原形，should可以省略。注意这种句型中的虚拟语气形式不受主句动词时态的影响。Theories concerning on the individual suggest that children engage in criminal behavior because they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through interactions with others.(2004 CLOSE)

此句是个含有一个宾语从句、两个原因状语从句的复合句。suggest是主句谓语，Suggest 后面的宾语从句中的谓语动词engage in前面省略了should.

参考译文：关于个体研究的理论认为，孩子们从事犯罪活动是因为以前他们做错事情时对他们的惩罚力度不够，或是因为他们通过与其他人的交往学会了犯罪。

第三，虚拟语气在同位语从句中的运用

名词advice、assumption、decision、demand、desire、insistence、order、proposal、requirement、recommendation、suggestion……后面若有同位语从句，从句的谓语动词也应使用虚拟语气的形式。

Such behaviour is regarded as “all too human”，with the underlying assumption that other animals would not be capable of this finely developed sense of grievance. (2005年TEXT1) 这是个含有同位语从句的复合句。that引导的同位语从句的谓语动词由would+动词原形be构成。

参考译文：这样的行为被认为“完全是人类独有的特点”，其潜在的含义是其它动物没有这种敏锐的委屈感。

第四，虚拟语气在表语从句中的运用

与同位语从句一样，若主语是某些特定动词的同根名词(参考上一部分同位语从句)，要在它后面的表语从句要用虚拟式。

Another decision is whether the school should be one of the vast majority financed by the State or one of the very small but influential minority of private schools，though this choice is，of course，only available to the small number of those who can pay. (英语专业四级考试01年Text D)

这是个含有表语从句的复合句。主语是another decision;谓语是is;whether……or……是表语从句，其中谓语动词由should+动词原形be构成。参考译文：另一个要做出的决定是：应该选择一所占绝大多数的国立学校呢，还是选择一所数量虽小却有影响力的私立学校呢，当然，只有少数有支付能力的人才有这种选择的权利。

总之，虚拟语气是考研英语中的重要考点，频繁地出现在历年真题中。所以，2012年的考生在平时备考中一定要认真复习，理解它在不同语境中的用法。

高中英语语法虚拟语气教学设计

高中英语语法虚拟语气 教学设计 集团档案编码：[YTTR-YTPT28-YTNTL98-UYTYNN08]

高中英语语法虚拟语气教学：The subjunctive mood 厦门第十中学吕瑞珠 一、概述 本节课是高中英语语法教学课，授课内容为虚拟语气，授课对象是高三年学生。从呈现、加深记忆、巩固到实践并将语言项目运用于写作中并做适当的点评，大概需要两课时。但我这里着重阐述的是第一课时的教学内容、教学策略等。 通过本节语法教学课的学习，学生重新整合自己的有关虚拟语气的知识，复习已知的虚拟语气的表达形式如：I wish I could fly freely in the sky like a bird; It is high that you got up.等等，并学习新的表达形式如：The English teacher suggested that we should read the English newspaper every day; I would have passed the English exam if I had worker harder in the past 20 days.最为重要的是，学生在学习完虚拟语气的表达形式后，要在写作中运用。 虚拟语气在高中英语语法的难点之一，多数学生感到费解，因此也更需要老师的指导与相应的实践与运用，并且较好地掌握虚拟语气的表达形式，有助于扫除学生阅读过程中对个别句子的理解。 二、教学目标分析 1．知识与技能 1）复习学生已掌握的虚拟语气表达的句型： I wish I were… / I could … It is high time that you did your homework.. If I were you, I would… 2) 学习虚拟语气新的表达方式，尤其是if引导的虚拟条件状语从句，掌握与现在事实、与过去事实、与将来事实相反的三种虚拟语气的表达，特别是主句与从句时态的呈现；还有引导出的宾语从句需要运用虚拟语气的动词，如suggest, insist, propose, demand and so on. 3）培养学生运用所学知识表达自己的思想的能力。 2．过程与方法 1）引导学生在欣赏英文歌曲An Angel的情景教学过程中，开启对虚拟语气表达已有的知识记忆。

英语虚拟语气语法归纳总结

虚拟语气: 表示说的话不是事实，不可能发生或者说可能性很小的情况，表达一种愿望、建议、假设。 if were/did, would do if had done, would have done if were to do/should do, would do 举例： If I were you, I would do nothing about it. If you had taken your teacher’s advice, you wouldn’t have made such a mistake. If it were to/ should rain tomorrow(表示降水率很低)，they wouldn’t go shopping. 附注： 虚拟语气，条件状从倒装 状语从句中，去掉if,提前were/ had/ should 如：If I were you, I would give up. →Were I you, I would give up If you had taken the advice, you would have…. →Had you taken the advice, you would have… If the world shou ld come to an end,…… →Should the world come to an end…… 另外，without, but for, otherwise构成的条件状语从句中，也有含蓄的虚拟语气But for the popularization of electricity, we would lead a whole different life today. (popularization 普及，publicity 宣传) Without your help, I would have failed. We’ll go earlier, otherwise we wouldn’t get a seat.（表示可能性小）

英语常见虚拟语气最全总结

英语常见虚拟语气最全总结 一、初中英语虚拟语气 1．If I ____ a candle, I would light the world bright. A．am B．are C．be D．were 【答案】D 【解析】 试题分析：句意：如果我是一根蜡烛，我将点亮这个世界。if I were 如果我是…，were虚拟语气，be动词都用were,故选D 考点：if条件句的虚拟语气 点评：if条件句的虚拟语气，是中考要求掌握的知识点，分为三种情况： 表示与现在事实相反的情况，从句谓语动词用一般过去式（be用were），主句谓语动词 用should/would/could/might +do;2.表示与过去的事实相反的情况，从句谓语动词用过去完成时，主句谓语动词用should/would/could/might+have done;3.表将来的事实相反的情况，从句谓语动词用should+动词/did/were to do，主句谓语动词用should/would/could/might +do。 2．If I _______ you, I _______ go there. A．is; will B．is; would C．were; would D．was; will 【答案】C 【解析】本题考查虚拟语气，if引导的与现在事实相反的虚拟语气。从句用一般过去式，主句用过去将来时。句意：如果我是你的话，我会去那儿的。 1.57．---What would you do if you a million dollars? ---If I you, I’d g ive it to medical research. A．got, were B．win, am C．won, am D．get, were 【答案】A 【解析】本题是考查的虚拟语气，对于将来的假设，主句用过去将来时，从句用一般过去时，且be动词为were，故选A 2.58．What _____ you _____ if you had a million dollars? A．would, did B．will, do C．would, do D．will, did 【答案】C 【解析】本题是对于虚拟语气的特殊疑问句的考查，根据句子的结构，选C 3．I suggest that we Chinese people_______Chinese culture with love and joy everywhere we go. A．spread B．spreading C．to spread D．will spread 【答案】A 【解析】 【详解】 句意：我建议我们中国人无论走到哪里都要带着爱心和欢乐来传播中国文化， 考查动词suggest后跟虚拟语气。spread是动词原形；spreading是动名词；to spread是动

考研英语语法大全———自己总结

考研英语十二大基础语法体系 对于任何英语句子，要分析其结构，这样才能找到英语语言的规律。每种语言都有它的难点，汉语的难点在于汉语不是拼读语言，汉字很难写，而且有四种声调。其实，许多接触过多种外语的人都认为，英语的语法比法语、德语、俄语、日语等都简单，是最容易学的。著名语言学家乔姆斯基说过，语法是内生的、也就是随着语言的诞生而诞生的。因此，学习语法和学习语言是相辅相成的。 一、英语动词的时态 （一）英汉两种语言在时态表达方式上的差异： 英语的词类与汉语的不同。汉语词类形态稳定，比如“书”这个字，“一本书”、“三本书”都一样，没有词形变化。英语就不同了，book, books仅从词形上就能知道是单数还是复数。 动词是英语中变化最多、最复杂的词类。有人说，学好英语就是学好动词，此言甚是。同一个动作或状态分别在不同时间发生或存在，表达这个动作或状态的动词就要用不同的形式，这就是时态。 （二）英语动词的形式： 英语的时态是通过动词的变化来体现的。因此，了解动词的形式及其变化规律非常重要。英语的实义动词有以下五种形式： (1)动词原形：动词原形在句子中形式不变。主要用于主语为非第三人称单数的一般现在时，情态动词之后， 或根据语法规定必须用动词原形的其他情况。 (2) 一般现在时第三人称单数形式（简称现单三）：主要用于主语为第三人称单数的一般现在时。 (3) 过去式：主要用于一般过去时。 (4) 现在分词：主要用于进行时态，或语法规定的其他情况。 (5) 过去分词：主要用于完成时态，或语法规定的其他情况。 动词一般现在时第三人称单数（现单三）的构成，见下表：

即某些字母组合的不规则动词有一定的规律。如：weep→wept, sleep→slept, sweep→swept 以上每个时间段中分别有四种状态：一般、进行、完成和完成进行。因此我们便有了四四一十六个时态。 态（一般、进行、完成、完成进行）。 比如在“They are doing their exercises.”这个句子中，动词由原形do 变成are doing 的形态，说明这个事情是发生在现在、并处于正在进行的状态当中，所以叫现在进行时； 在“They have done their exercises.”这句中，动词由原形do 变成have done的形态，说明这个事情是发生在现在、并处于完成的状态，所以叫现在完成时； 在“They always do their exercises.”中，动词用原形do 的形态，说明这个事情是发生在现在、并且是一般情况下永远如此，所以叫一般现在时。 在这三句话中，动词do 虽然用了不同的形态，其意义没有变化，而是事情发生的时间和状态变了。其余类推。 （三）时态详解 16个时态中，常用的有12个：一般现在时、一般过去时、一般将来时、过去将来时、现在进行时、过去进行时、将来进行时、现在完成时、过去完成时、将来完成时、现在完成进行时和过去完成进行时。其他时态很少单独使用。 下面把各种时态的构成和用法做一个全面的介绍。

考研英语语法虚拟语气解析(二)

凯程考研，为学员服务，为学生引路! 考研英语语法虚拟语气解析（二） 六、个别特殊短语 would rather，had rather，had better，would （just） as soon， would sooner 均作 "但愿，宁愿”讲时： （一）后接动词原形，表示现在或将来的一种主观愿望或选择 例句：1 would rather go there with you ，because you are the only person that I have been acqua in ted with. 分析：该句是复合句，定语从句that I have bee n acqua in ted with 修饰the only person。 译文：我宁愿和你一起去那儿，因为你是我在这里唯一熟悉的人。 （二）后接从句，从句动词一般用一般过去时表示现在或将来的愿望，动词用过去完成时表示过去的愿望 例句：I d rather he stayed there，because weather is said to be somewhat worse accord ing to the n ews. 分析：该句是复合句，weather is said to be...是it is said that...的变形。 译文：我希望他待在那儿，因为据新闻报道天气将会很恶劣。 例句：I d rather you had not bee n so rude to her，she was a new comer after all. 分析：该句是复合句，其中after all意为"究竟，毕竟”，you had not been so rude to her 表示与过去事实相反假设。 译文：真希望你不要对她那么粗鲁，毕竟她是新来的。 七、as if/as though引导的方式状语从句 表示“仿佛，好像”时也用虚拟式，从句中动词用一般过去时（be用were）表示与现在 相反假设；动词用would/could/might+动词原形表示与将来相反假设；动词用过去完成时表示与过去相反假设。 例句：The rats develop bacterial infections of the blood as if their immune system —the self protect ing mecha nism aga inst disease—had crashed. 分析：该句是复合句，as if their immune system had crashed 是方式状语从句，两个破 折号间的内容是对system做进一步的解释。 译文：老鼠感染血液病毒后，似乎它们的免疫系统一一即抵御疾病的自我保护机制一—被彻底摧毁了。 例句：But it s not as if earlier times didn t know perpetual war，disaster and the massacre of innocents.（选自2006 年Text 4） 分析：该句是复合句，as if引导的方式状语从句在句中作表语。 译文：但是这不是说以前的时代没有经历过连续不断的战争、灾难和滥杀无辜。 另外，as if（as though）后面的从句也可用陈述语气，尤其在it looks/seems as if（as though）结构中。 例句：The sun rises in the east and sets in the west，so it seems as if the earth is circling round the sun.

高中英语语法(虚拟语气)

Unit13虚拟语气专题讲解 【知识要点】 语气（mood）是一种动词形式，用以表示说话者的意图或态度。 英语有三种语气： ＊直陈语气（indicative mood）---- 事实 France lies to the east of England. ＊祈使语气（imperative mood）---- 请求、命令 Make yourself at home. ＊虚拟语气（subjunctive mood） If there were no air and water , we should not be able to live on the earth. 虚拟语气表示说话人的一种主观愿望或假想，所说的是一个条件而不一定是事实，或与事实相反。 一. 虚拟语气在if条件状语从句中的用法 假设类型条件从句谓语 动词形式 主语谓语 动词形式 与现在事实相反动词的过去式(be用were而不用was) should/ would /could/ might+动词原形 与过去事实相反had + 过去分词 should/ would/could /might + have+过去分词 与将来事实相反1.should+动词原形 2.动词过去式 3.were to+动词原形 should/ would/ could/ might +动词原形 1. 在错综条件句子中，虚拟条件从句和主句动作发生的时间不一致，因此，主句和从句的谓语动词应根据所指的时间选用适当的虚拟语气形式。 1）If I were you，I wouldn't have missed the film last night． 2）If he had followed the doctor's advice，he would recover already．（从句与过去事实相反，主句与现在事实相反。） 2、在if虚拟条件句中，有时可把连词省去，采用倒装语序把谓语动词were或助动词did，had，should 移到句 首构成非真实条件从句的另一种句型，其意思不变。 1）Had we time to spare，we would be glad to go to the park． 2）Were it not for the discovery of electricity，the modern world would experience great inconvenience． 3、有时假设的情况不用if引导虚拟条件从句来表述，而用介词（如without， but for等）引出的短语、分词 （如supposing等）引出的短语、并列连词（如or，otherwise，but，though等）、由动词suppose引出的祈使句或通过上下文的意思来表达。此时句中谓语动词仍采用虚拟语气的相应形式。 1）But for your advice，I would not be able to do this work． 2）Victor obviously doesn't know what's happened，otherwise he wouldn't have made such a stupid remark．。

英语虚拟语气类型用法

二、虚拟语气的判断： 1. if 条件状语从句中虚拟语气的判断。if 条件状语从句有真实条件句和非真实条件句。假设条件可以实现的句子为真实条件句，反之为非真实条件句，要用虚拟语气。其形式分为以下三种： (1) 与过去事实相反的假设。结构为：从句的谓语动词用“had + 过去分词”，主句用“should (would, could, might) + have + 过去分词”。例如： If it had not rained so hard yesterday, we could have played tennis. 如果昨天没有下大雨，我们就能玩网球了。 (2) 与现在事实相反的假设。结构为：从句的谓语动词用过去式，系动词用were，主句的谓语用“should (would, could, might) + 动词原形”。例如： If I were in your position, I would marry her. 如果我是你，我就娶她为妻。 (3) 与将来事实相反的假设。结构为：从句的谓语动词用“should (were to) + 动词原形”，主句用“should (would, could, might) + 动词原形”。例如： If you should miss the chance, you would feel sorry for it. 如果你错过了这次机会，你会难过的。 2. 宾语从句中的虚拟语气。 (1) wish后接宾语从句中的虚拟语气：根据从句的意义来判断。 A: 表示与现在和将来事实相反的愿望，从句谓语动词用过去时态。例如： I wish they were not so late. 要是他们来得不是这么晚就好了。 B: 表示与过去事实相反的愿望，从句谓语动词用过去完成时态。例如： I wished he hadn't done that. 我真希望那件事不是他做的。 (2) 表示“要求、建议、命令”等动词后面的宾语从句中的虚拟语气。用于此结构的动词有：advise, direct, agree, ask, demand, decide, desire, insist, order, prefer, propose, request, suggest 等。从句的谓语动词用“should + 动词原形”，其中should 可以省去。例如： I insisted that he (should) go with us. 我坚持让他和我们一起去。 注意：当insist 表示“坚持认为”、suggest表示“表明，显示”时，不用虚拟语气。例如：

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高考英语虚拟语气知识点经典测试题及解析 一、选择题 1．I insisted he______ back the wallet to the lady, but he insisted he______it. A．handed; didn’t steal B．hand; hadn’t stolen C．hand; not steal D．handed; hadn’t stolen 2．Recent years have seen a growing increase in the emergence of cyber terms, without which our life _____ so colorful nowadays. A．won’t be B．hadn’t been C．wouldn’t be D．can’t be 3．This winter vacation, my family are going to visit the Great Wall, but I would rather we ________ to Shanghai Disneyland. A．go B．had gone C．would go D．went 4．The requirement of the government is that the citizens not set off fireworks from January 1, 2019 on. A．shall B．should C．can D．may 5．What do you think of the proposal that improvement ____ in the type of vacuum cleaner? A．be made B．will be made C．would be made D．has to be made 6．I wish I ________ an architect because then I ________ be able to design my own house. A．am, will be B．were, would C．will be, could D．was, could 7．How I wish I ______ my mouth before I shouted at my mum! A．shut B．have shut C．had shut D．would shut 8．That was not the first time he ____ us. I think it's high time we ____ strong actions against him. A．betrayed, take B．had betrayed, took C．has betrayed, took D．has betrayed, take 9．Studies show that historical barriers on women acceptance in organizational environments, the development of the company would already be way ahead. A．were it not for B．if there being no C．hadn't it been for D．if it is not for 10．The board thought it urgent that these files _____ right away. A．printed B．had been printed C．would been printed D．be printed 11．What a pity! Considering his ability and experience, he ___________ it better. A．need have done B．must have done C．can have done D．might have done 12．If penicillin available, many people from sickness or even small wounds in World WarⅡ.

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考研语法精讲 第四讲虚拟语气 1.什么是虚拟语气 【2010】Marketers have embraced the two-step flow because it suggests that if they can just find and influence the influential, those selected people will do most of the work for them. 【2007】If you were to examine the birth certificates of every soccer player in 2006’s World Cup tournament you would most likely find a noteworthy quirk: elite soccer players are more likely to have been born in the earlier months of the year than in the later months. 英语语气：（1）陈述（2）祈使（3）虚拟 虚拟语气： 表示说的话不是事实，或者是不可能发生的情况，而是一种愿望、建议或与事实相反的假设等 【2003】If railroad charged all customers the same average rate, they argue, shippers who have the option of switching to trucks or other forms of transportation would do so, leaving remaining customers to shoulder the cost of keeping up the line. 【2007】If you were to examine the birth certificates of every soccer player in 2006’s World Cup tournament，you would most likely find a noteworthy quirk: elite soccer players are more likely to have been born in the earlier months of the year than in the later months. 【2008】In the early 1960s, Wilt Chamberlain was one of the only three players in the National Basketball Association (NBA) listed at at over seven feet. If he had played last season, however, he would have been one of 42. 2.虚拟语气在条件从句中的应用 ①If it were not raining, we should go for a picnic. 如果现在不下雨的话，我们就出去野餐了。 （事实是：天在下雨，我们不能出去野餐。表示愿望。） ②If he came here, he might be able to help you. 如果他来这，他就能够帮助你了。 （事实是：他没来这，他不可能帮助你。表示对他的良好印象。） ③She would have gone to the party if she had been invited. 要是当初她被邀请的话，她就会去参加这次聚会了。 （事实是：当时没有人邀请她，因此，她没有来参加聚会。表示后悔。）

大学英语语法-虚拟语气

虚拟语气 1. I wish (that可省略,下同)I knew the answer to the question.我希望知道这个答案。(事实上是不知道) 2. He wishes he hadn't lost the chance. 他真希望没有失去机会。(其实已失去) 3. You wished she would arrive the next day.(would + arrive) 你希望她第二天会到。(事实上她还没到) Subjunctive Mood作为专门表达假设意义和其他非事实意义的动词形式，仅是古英语遗留下来的残余。它仅有两个形式，即be型虚拟式和were型虚拟式。 Be型虚拟]----- be型虚拟式是以动词原形表示的，不管主语是什么人称，动词一律用原形，如动词为被动态，则助动词be也用原形。其主要用法如下： 1)用于表命令、决定、建议、坚持等词语之后的that分句中 这一用法又分三种情况： a)用在 decide,decree,demand,insist,move,order,prefer,propose,recommend,request,require, suggest,vote等动词之后的that分句中.（宾语从句） 在expect, believe, think, suspect等动词的否定或疑问形式后的宾语从句中，我们经常用“should＋动词原形(或完成形式)”，表示惊奇，怀疑，不满等。 He ordered that all the books be sent at once. He ordered that all the books be sent at once. we propose that somebody neutral take the chair. She insisted that she go to the south for her holiday. b)用在 advisable,appropriate,desirable,essential,fitting,imperative,important,impossible,nece ssary,obligatory,proper等形容词之后的that分句中。（主语从句） It is essential that all the facts be examined first. It was appropriate that thisi tax be abolished. I thousht it advisable that an armed guard stand in readiness. c)用在 decision,decree,demand,instruction,order,requirement,resolution等名词之后的that分句中。 The board has given instructions that the agent fly to Boston. We were faced with the demand that this tax be abolished. Their decision was that the school remain closed. 在这一用法中be型虚拟式能与“should+不定式”交替使用，也能与to-不定式交替使用。 He ordered that the books be sent at once . = He ordered that the books should be sent at onc. = He ordered that the books to be sent at once. 2）用于由if,though等引导的分句中.

高中英语提高之虚拟语气用法

虚拟语气用法 虚拟语气用法
概念
虚拟语气用来表示说话人的主观愿望或假想， 而不表示客观存在的事实， 所说的是一个条件， 不一定是事实，或与事实相反。虚拟语气通过谓语动词的特殊形式来表示。英语中的语气分 为陈述语气、祈使语气、虚拟语气三类。
应用条件
在表示虚假的、与事实相反的或难以实现的情况时用虚拟语气，表示主观愿望或 某种强烈情感时，也用虚拟语气。即当一个人说话时欲强调其所说的话是基于自己的 主观想法，而不是根据客观实际，就用虚拟语气。
在非真实条件状语从句中的用法
真实条件状语从句与非真实条件状语从句
条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表 示的是假设或实际可能性不大的情况，故采用虚拟语气。 例： If he doesn’t hurry up, he will miss the bus. 如果他不快点，他 将错过巴士。( 真实) If he is free, he will ask me to tell stories. 如果 他是空闲的，他会要求我讲故事。 （真实） If I were you, I would go at once. 如果我是你， 我马上就会去。（非真实， 虚拟语气） If there were no air, people would die. 如果没有空气，人就会死亡。 （非真实，虚拟语气）
用法及动词形式
从句
If+主语 +did If+ 主语+did 主语 were） （ be 动词 were ）
主句
与现在事实相反
主语+should/would/ 主语 +should/would/ could/might+do

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何凯文考研英语十五大背诵句

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第二句背诵5,7 适当修改 第五局： China Daily interviewed four people from four professions——a surgeon, a civil servant, a lawyer and a steelworker. The survey discovers that all of them are of the idea that 主题很重要。According to a survey conducted by China Academy of (Social)Science(CAS)/(CASS),主题很重要。 第三段（30——60）评论或举例。 1、正面话题 第一句：取其精华，去其糟粕。 第二句：如何面对 第三局：展望未来 Uttermost. 2、负面话题 第一句：背诵3 第二句：句群1、背诵句4；2、专家学者想办法；3、大众提升意识

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①错综时间条件句: 当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，被称为错综时间条件句，动词的形式要根据它表示的时间作出相应的调整。如： If you had followed my advice just now, you would be better now. If you had studied hard before, you would be a college student now. ②if省略句 在条件句中可以省略if, 把were, had, should提到句首，变成倒装句式。如：If I were at school again, I would study harder. →Were I at school again, I would study harder. 如果我还有上学的机会，我会更加努力学习。 If you had come earlier, you would catch the bus. →Had you come earlier, you would catch the bus. 如果你来得早点，你就能赶上公共汽车。 If it should rain tomorrow, we would not go climbing. →Should it rain tomorrow, we would not go climbing. 如果明天下雨的话，我们就不能登山去了。 ③用介词代替条件状语从句 常用的介词有with, without, but for。如： What would you do with a million dollars? (=if you had a million dollars) 如果你有100万元，你会做什么？ We couldn?t have finished the work ahead of time without your help. (=if we

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