大学英语四级考试语法讲义：虚拟语气英语四级高级语法：虚拟语气
1. if 引导的虚拟语气
2. 倒装形式
Were I you (=if I were you) , I would get up early in the morning.
Had you arrived at the station ten minutes earlier yesterday(=If you had arrived…), you could have caught the train.
Should it rain (=If it should rain), the crops would be saved.
【2】馒头面条原理
【3】固定句型
It is time that ...
Would rather that .....
(1).I would rather he came tomorrow than today.
(2).John would rather that she had not gone to the party yesterday evening.
(4).I would rather everything hadn' t happened in the past.
“It is (was)+形容词(或过去分词)+that……”结构中的虚拟语气
1. It is necessary that we (should 可省略,下同)have a walk now.
2.It was necessary that we (should) make everything ready ahead of time.
3. It is required that nobody (should) smoke here.
4. It is important that every pupil (should) be able to understand the rule of school.
练习
1. He’ll be busy this afternoon. If he ___ free, he ___ to the cinema with you.
A.were to be; might go
B. am going to be; will go
C.will be; might have gone
D. is; will go
2. When Edison died, it was proposed that the American people _____ all power in their homes, streets, and factories for several minutes in honor of this great man.
A. turn off
B. turned off
C. would turn off
D. had turned off
3. Had I known her name, _____.
A. or does she know mine?
B. and where does she live?
C. I would have invited her to lunch
D. she would be beautiful
4. I’d rather you ______ by train, because I can't bear the idea of yo ur being in an airplane in such bad weather.
A. would go
B. should go
C. went
D. had gone
5. The victim ________ (本来会有机会活下来) if he had been taken to hospital in time.
would have a chance to survive (06.12翻译)
6. The professor required that ________ (我们交研究报告)。
we hand in our research report(s) (06.6翻译)
7. If Sept. 11 had never happened, the airport workers would not have been arrested and could have gone on quietly living in America, probably indefinitely.
(06.6阅读)
8. W: What would you do if you were in my place?
M: If Paul were my son, I’d just not worry. Now that his teacher is giving him extra help and he is working hard himself, he’s sure to do well in the next exam.
Q: What’s the man’s suggestion to the woman?
13. A) Teaching her son by herself. C) Asking the teacher for extra help.
B) Having confidence in her son. D) Telling her son not to worry. (07.12)
1.You’d better take a sweater with you ________________ (以防天气变冷)
in case it (should) turn cold. (08.12)
10. If she had returned an hour earlier , Mary (就不会被大雨淋湿了). 09.6
. wouldn’t have been caught by the rain
11. You would not have failed if you __________________________(按照我的指令去做).
had followed my instructions/orders (09.12)
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。
大学英语四级考试语法：—定语从句 很多同学在大学英语四级考试中会存在一些误区，认为语法不那么重要，其实英 语语法是学习英语的指南，对我们帮助很大。以下是小编给大家整理的大学英语四级 考试语法：—定语从句，希望可以帮到大家 1、mary is a beautiful girl. 名词的扩展靠限定，最基本的就是在名词的前面增加一个形容词这样的定语，上 面的句子就是表语girl的前面加了一个形容词。显然，如果只是mary is a girl这样的 句子会让人觉得非常枯燥，没有什么意义，所传递的信息量极其有限。所以，名词前 面加定语，可以使被限定的名词更加生动，更加形象而富有生命。如果要对名词给出 更多限定，挖掘更多内部信息，我们可以在名词前面加多个定语来限定，如mary is a beautiful chinese girl. 放在名词前面起到限定作用的定语有很多种形式，形容词，名词，动词现在分词，动词过去分词等。虽然形式多样，但是这类定语还是比较好理解，只要顺着句子的顺序，就基本可以明白是怎么回事。 2、the computer that i bought yesterday works well. 有时候，我们需要对名词给出很多的说明，用大量的信息来限定名词。这时，如 果还是把长长的限定成分放在名词前面，就会头重脚轻，所以英语中会用跟在名词后 面的定语从句来限定前面的名词。根据定语的功能还可以分为限制性定语从句和非限 制性定语从句。两者的区别在于前者与被限定名词之间没有逗号，而后者则有逗号隔开;前者起到限定作用，不可或缺，后者起到补充作用，舍去后对剩余部分影响不大。 本句子通过“that i bought yesterday”这个that引导的定语从句，使得主语the computer得到限定而明确，是我昨天买的计算机而不是别的。如果明白了这个名词可 以通过后面加定语从句来扩展，我们的句子马上可以变得复杂起来，请看下例：another popular spectator sport, which is known as the sport of kings, is horse-racing, which is controlled by the jockey club. 译文：另一种以特大型运动著称的流行观赏运动是赛马，这种比赛由赛马总会控制。
A.从介词开始到其后跟的名词结束 B.从介词开始到动名词结束 C.从介词开始到动名词的宾语结束2018年12月大学英语四六级语法精讲课程讲义 一、识别句子成分必须记住的原理 1.衡量是否是一个句子的标准：是否有动词，有动词就是句子，反之不是句子。 2.英语构句原则规定：一个简单句中只能有一个谓语动词 3.长难句的构成：主句、从句、介词短语、非谓语动词 （1）主句的辨识：谓语动词 （2）从句的辨识：连词+与之匹配的谓语动词 （3）介词短语： （4）非谓语动词：4.衡量长难句划分是否正确的标准：整个句子中谓语动词的个数比连词多一个 5.长难句划分方法：连动切割法 ·连动切割法：将句子中的所有连词和动词（连词、动词的排列不分先后）作为切割长难句的基 础，断开主句和从句。 ·长难句划分的具体步骤： 【第一步】断开主句和从句 通读整个句子找出所有的连词或动词，并将连词和动词匹配起来（主要是针对从句而 言，主句不存在连词，从句连词和动词的匹配遵守就近原则），然后再给动词匹配主 语（主句的主语在谓语之前找；从句的主语在连词和与之匹配的谓语动词中间找，如 果它们中间没有任何词语，那么连词本身就是这个从句的主语。） 动名词（doing ） 动词不定式（to do ） 现在分词（doing ） 过去分词（done ）
【第二步】断开介词短语和非谓语动词 二、总结复习句子的主要成分 1、主语 （1）定义：主语是动作的发出者。 （2）位置：在谓语动词之前。 （3）什么可以充当主语： 2、谓语 （1）定义：述说主语的动作或状态。 （2）位置：在主语之后。（3）什么可以充当谓语：实意动词。 3、宾语 （1）定义：（2）位置： （3）什么可以充当宾语：4、表语 （1）定义：表述主语的身份特征，性质状态的 （2）位置：在系动词之后 （3）什么可以充当表语： A.名词： B.代词： C.介词短语： D.非谓语动词： E.句子：A.动作的承受者B.介词所联系的对象，即介词宾语（简称介宾） A.名词： B.代词： C.介词短语： D.非谓语动词： E.句子： A.名词： B.代词： C.形容词 D.介词短语： E.非谓语动词： F.句子：A.在谓语动词之后B.在非谓语动词之后C.在介词之后
虚拟语气在非真实条件句中 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。否定句时not留在原来位置不变。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)
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）
plete 指完成一件指派或预定的任务,或完 善、完整未完成的部分 gain 指需要做出比 obtain 更大的努力,往往指通过竞争获得某些有价值的东西obtain 指经过努力或付出代价或经过很长时间儿得到所需要的东西end 指一个动作或一件事情的结束或终止 finish 指把一件事或一个动作做完,强调 事情的了结、终止 7、4 、 accurate , correct , delicate , exact,precise 都含有一定的"正确,精确" 之意 acknowledge,admit,concede,confess,rec ognize 都含有一定的"承认"之意acknowledge 着重”公开承认”,常用来指过去曾隐瞒或否认的事accurate 准确的,精确的,指某人或某事 不仅不出错,而且与事实无出入,强调准 确性 admit 是指在压力下不得不承认已经证实或难以否认的事实,招供(事实,错误等)concede(不情愿地)承认,(在结果确定前)承认失败correct 正确的,指某人或某事合乎事实或 公认的标准或规则,没有错误 delicate 精美、精细的、雅致的 exact 确切的、精确的,语气较 accurate 强, 指某人或某事数量或质量完全符合事实或 标准,而且在细致末节上也丝毫不差 precise 精密的,指具有高度的精确性和准 确性,强调范围界限的鲜明性或细节的精密, 有时略带"吹毛求疵"的贬义 confess 着重承认自己的过错或罪恶recognize 指正式承认主权、权利等8、affirm,assert,allege,claim 都含有一定的"宣称,断言"之意affirm 断言,肯定,指根据事实坚定不移地宣称,有无可争辩之意assert 宣称,坚持,指不管事实如何,主观自信地宣称5、accuse,charge,indict 都含有一定的 "指控,控告"之意 allege 宣称,断定,指在无真实根据情况下宣称,硬说accuseaccusesb.ofdoingsth. 为 … 指 责 某 人,控告某人 claim 声称,主张,往往表示说话者反对或不同意某一观点chargechargesb.withdoingsth. 指 控 某 人… 英语四级温习资料 2(2006-12-1116:02:10)分类：大学英语四六级温习资料征服大学英语四级考试（阅读篇）（一）存在问题6、achieve,acquire,attain,gain,obtain 都含有一定的"获得,达到"之意 achieve 强调由于极大的努力,克服困难后 达到目标 第一,读不懂acquire 指经过不懈努力才获得的技术,知 识等抽象的东西,也指养成习惯等 attain 正式用语,指经过艰苦努力才使人达 到完美境地所谓读不懂,就是考生拿过文章,满头雾水,即使硬着头皮读文章,也是一知半解。然后匆忙做体,仅凭感觉去蒙,因此做体准确率必然不高。
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．。
新概念英语第二册语法总结：虚拟语气 虚拟语气分三种情况来掌握： 1、虚拟条件句。 2、名词性虚拟语气。 3、虚拟语气的其他用语。 一、虚拟条件句： 条件状语从句是非真实情况，在这种情况下要用虚拟语气。 1、条件从句与现在事实不一致，其句型为： If 主语＋过去时，主语＋should(could, would, 或might)＋动词原形，如： If I were you, I would study hard. If it rained, I would not be here now. 2、条件从句与过去事实不一致，句型为： If 主语＋had＋过去分词，主语＋should(could, would, 或might)＋have＋过去分词，如：If the doctor had come last night, the boy would have saved. If I had not studied hard, I would have failed in the exam last term. 3、条件从句与将来事实不一致，句型为： If 主语+should(were to, 过去时)＋do，主语＋should(could...)＋原形do，如： If it should rain tomorrow, we would stay at home. If I were to go to the moon one day, I could see it with my own eyes. If you missed the film to night, you would feel sorry. 注意问题： 1、If条件句中绝对不可出现"would"。 2、根据句中的时间状语，有时可能出现“混合虚拟”的情况，即主句可能是现在的情况，条件句也许是发生在过去的情况，但都是遵守上述句型。 3、在条件句中如果出现were, had, should可省去if，将主语与这些词倒装，例如： Had the doctor come last night, the boy would have saved. Were I to go to the moon one day, I would see it with my own eyes. Should it rain tomorrow, we would stay at home.
2014年大学英语四级基础语法讲义8 My shoes are worn out. My shoes are worn out.我的鞋穿破了。 Be worn out 表示“穿破了”，这个词组看起来是被动形式，但并不强调被动，强调的是状态或者情况，可以理解为形容词短语。例如： My clothes are worn out and I have to mend them. 我的衣服穿破了，我得补一下。 You see,this glass is broken. 你瞧，这个杯子破了。 ★You'd better buy a new pair. You'd better buy a new pair.你最好买一双新的。 A pair of…表示“一对”，“一双”，指一起使用的两个相同的东西。例如： Have you bought a pair of shoes? 你买了一双鞋吗？ This pair of glasses is very good for me. . . . .
这副眼镜我戴很好。 ★That's a bit expensive. That's a bit expensive.价钱有点贵。 A bit 表示“一点儿”，“有些”，在句中作定语或者状语，相当形容词或者副词。与a little 是同义词。例如： It's a bit cold today;you'd better put on more clothes. 今天有点冷，你最好多些穿衣服。 If you study a bit hard,you can pass the exam. 如果你多一点努力学习，你就能考试及格。 Please give me a little water. 请给我一点儿水。 ★The shop was quite new,for it had opened only the week before. The shop was quite new,for it had opened only the week before.因上周才开的，所以商店很新。 For 表示“因为”，相当于because 和as.表明原因，三个词中，because语气最强，for 语气最弱。For 表明的原因要写在后面。例如： I want to go to bed,for I feel tired. 我想去睡觉，因为我感到累了。 . . . .
高中英语语法讲解--虚拟语气 1. 语气的定义和种类 （1）语气的定义 语气是动词的一种形式，它表示说话人对某一行为或事情的看法和态度。 （2）语气的种类 A. 陈述语气 表示动作或状态是现实的、确定的或符合事实的，用于陈述句、疑问句和某些感叹句。 We are not ready. Did it rain all day yesterday? What a fine day today！ B. 祈使语气 表使说话人的建议、请求、邀请、命令等。 Be careful. Don’t forget to clo se the window. Open the door, please. C. 虚拟语气 表使动作或状态不是客观存在的事实，而是说话人的主观愿望、假设或推测等。 2. 虚拟语气 一. 虚拟语气在条件句中的应用 学习虚拟语气在条件句中的用法之前我们必须清楚条件句的种类：条件句有真实条件句与非真实条件句(或称虚拟条件句)两种。真实条件句所表的假设是可能发生或实现的，句中的条件从句与结果主句都用陈述语气。如： If it doesn’t rain tomorrow, I will go for a picnic. 假若明天不下雨，我就去野餐。 Oil floats if you pour it on water. 你如把油倒在水里，油就浮起来。 虚拟条件句所表的假设则是不可能或不大可能发生或实现的，句中的条件从句与结果主句皆须用虚拟语气。 1. 与现在事实相反的虚拟条件句，条件从句的谓语用动词的过去式(be的过去式用were), 主句的谓语用should （would, might，could）+动词原形。 如： If 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。） If 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。） 2. 与过去事实相反的虚拟条件句，条件从句的谓语用had+过去分词，主句的谓语用should （would, might，could）+ have ＋过去分词。 如：She would have gone to the party if she had been invited.
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.
大学英语四级考试语法指导 名词性从句中的虚拟语气 第一节：宾语从句(Subordinate Clasue)中的虚拟语气 一、在动词wish后的宾语从句中的虚拟语气 在动词wish后的宾语从句中的虚拟语气，常省去宾语从句的引导词that。 一)、对现在情况的虚拟(与现在的事实相反)： 从句用过去式或过去进行式(时间上是同时的)。其句子结构为：宾语从句的谓语be和were(was)，实义动词用过去式。例： 1. I wish (that可省略,下同)I knew the answer to the question.(wish, 动词过去式knew)我希望知道这个答案。(事实上是不知道) 2. I wish it were spring in my hometown all the year around.(wish, were)但愿我的家乡四季如春。(事实上不可能) 3. I wish I were a bird.(wish, were)但愿我是只小鸟。(事实上不可能) 4. When she was at the party,she wished she were at home.(wished,过去虚拟动词were)(事实上并不在家) 5. Now that he is in China, he wishes he understood Chinese.(wishes,过去虚拟动词understood)
现在他在中国，他希望能懂得中文。(事实上并不懂) 6. When we begin the trip, they will wish they were with us.(will wish,过去虚拟动词were)(事实上并不和我们在一起) 二)、对过去情况的虚拟(和过去的事实相反)： 用wish表示对过去事情的遗憾。其句子结构为：宾语从句的谓语用过去完成时，或would, could, might+现在完成时。例： 1. I wish (that可省略，下同)I hadn't wasted so much time. 我后悔不该浪费这么多时间。(事实上已浪费了) 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. We wished he had spoken to us. (wished，had + spoken)(事实上他并没同我们讲) 4. I wish you had called earlier. (wish, had + called)(事实上已迟了) 5. They will wish they had listened to us sooner. (will wish,had + listened)(事实上并不如此)
虚拟语气的用法总结 语气：语气是动词的一中形式，它表示说话人对某一行为或事情的看法和态度。 虚拟语气表示动作或状态不是客观存在的事实，而是说话人的主观愿望，假设或推测等。如If I were you, I should study English. 一．虚拟语气在条件从句的用法 条件句有两类，一类是真实条件句；一类是非真实条件句，也就是虚拟条件句。 如果假设的情况是有可能发生的，就是真实条件句，谓语要用陈述语气。如If it doesn’t rain tomorrow, we will go to the park. 如果假设的情况是过去或现在都不存在的，或将来不大可能发生的，则是虚拟条件句。如If he had seen you yesterday, he would have asked you about it. 在含有虚拟条件句的复合句中，主句 If her mother had taken the doctor’s advice, she would/might have got well earlier. If it were to rain tomorrow, the match would be canceled. 有时候省略if，采用局部倒装语序。把had /should/were 等动词（不包括行为动词）移到从句的句首。例如： Were it to rain tomorrow, our picnic would be canceled. Had it not been for the storm, we would have arrived in time. Should the earth stop running, what would happen? 二. 错综时间条件句 有时条件从句的动作和主句动作发生的时间不一致，这时需要根据意思采用表示不同时间的动词形式来进行调整。 If she had taken the doctor’s advice, she might still be alive. If I were you, I would have accepted their terms. 三．含蓄条件句
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虚拟语气(the subjunctive mood,又称假设语气,是谓语动词的一种形式,表示说话人叙述的内容与事实相反,在现实中并不存在,或实现的可能性很小。 一、动词的语气 语气用来区别讲话人对某一行为或事情的看法和态度。英语中的语气(mood有三种,分别是陈述语气、祈使语气和虚拟语气。 1.陈述语气 陈述语气一般用来叙述事实或就事实提出询问,主要用于陈述句、疑问句和某些感叹句。 Where there is a will, there's a way. 有志者事竟成。 Can you help me carry the box upstairs 你能帮我把箱子搬到楼上吗? How I missed the life in the countryside! 我多么想念乡村的生活啊! 2.祈使语气 祈使语气表示说话人向对方提出请求或下达命令。 Come this way,please! 请这边走。 Don't make any noise, will you 别吵,行吗? Do be careful when crossing the street. 过马路时一定要小心。 3.虚拟语气 虚拟语气表示动作或状态不是客观存在的事实,而是说话人的主观愿望、假设或推测等。 If I were a bird, I could fly in the air. 如果我是一只小鸟,我就能在空中飞行。 I wish it were spring all the year round. 但愿四季如春。 May good luck be yours! 祝你好运! 二、条件句中的虚拟语气 英语中条件从句有两类,一类是真实条件句,另一类是非真实条件句。如果假设的情况可能发生,是真实条件句;如果假设的情况是不存在的或不大可能发生的,则是虚拟条件句。 A.真实条件句 真实条件句表示的假设是可能发生或实现的,主句和从句的谓语动词都要用陈述语气。 If he doesn't come at 8, we won't wait for him. 如果他八点不来,我们就不等他了。 If a flood happened in the past, there was usually a great loss of life and property.过去发生洪水的话,常有很大的生命和财产损失。 We shall go there unless it rains tomorrow. 如果明天不下雨,我们将去那里。 I'll let you use my bike on condition that you keep it clean. 如果你能保持车子干净,我就让你用我的自行车。 B.非真实条件句 在含有非真实条件句的复合句中,主句和从句的谓语动词都要用虚拟语气,其构成有三种形式: 与现在事实相反if条件句的谓语:were did
虚拟语气在非真实条件句中
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
大学英语四级常考语法总结 一、虚拟语气。应着重复习能引起虚拟语气的某些介词、介词短语和连词(如lest, in case, otherwise等);一部分表示建议、主张、命令等概念的词语，由于本身隐含说话人的主观愿望，其后的主语从句、宾语从句、同位语从句往往采用“should+动词原形”;虚拟倒装句;在would rather, wish, as if, it’s time that等句型中使用适当形式表达主观愿望;混合虚拟句。 二、独立主格题。一般说来，在句子中没有连接词的情况下，逗号是无力连接两个句子的，其中一个分句要么是非谓语形式，要么是独立主格结构。两种结构都做状语，不同的是独立主格结构有自己的逻辑主语。 三、时态。英语中共有16个时态。四级考试中出现最多的是将来完成时、现在完成时、过去完成时和完成进行时。 四、名词性从句。形容词性的定语从句是考核的重点，用什么引导词，引导词前面的介词形式，引导词在从句中做什么成分，从句的语序等均有可能成为考点。此外，主语从句、同位语从句、宾语从句也应适当复习。 五、主谓一致。这类考题灵活性大，需要根据实际情况判断谓语动词的单复数形式。一部分具有生命意义的集合名词做主语时谓语动词多采用复数形式，如people, poultry, militia等;用and连接的成分表单一概念时谓语动词用单数;就近原则：主语中含有某些连词(如as well as, besides, in addition to等)时，谓语动词的数同第一个主语保持一致。
六、倒装结构。分为全部倒装和部分倒装。那些否定词(组)、介词短语能引起倒装句，部分倒装和全部倒装有和区别，as在倒装结构中的用法及意义等等，都是考生应当重视的地方。 七、非谓语动词。①根据非谓语动词同其所修饰的名词或逻辑主语的一致关系，确定使用主动语态或被动语态，然后考虑采用现在分词、现在分词被动式或过去分词;②非谓语动词同主句谓语动词动作发生的先后关系。动作正在进行的用现在分词进行式，同时发生或不分先后发生的用现在现在分词一般式或过去分词;在主句谓语动词之前发生的用现在分词完成式、不定式完成式;发生在主句谓语动词之后的多用不定式一般式;③表状态多用分词，表目的多用不定式。