A. 英语语法中的虚拟语气，教教我该怎么掌握
一、虚拟语气的使用范围：
虚拟语气用来表示说话人所说的话并不是事实，而是一种假设、愿望、怀疑或推测。该语法主要用于if 条件状语从句中，也可用于主语从句、表语从句和宾语从句等。
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：
He insisted that she was honest. 他坚持认为她是诚实的。
3. 主语从句中的虚拟语气。
(1) It be + 形容词 + that... (should)...。用于该句型的形容词有：necessary, good, important, right, wrong, better, natural, proper, funny, strange, surprising等。例如：
It's natural that he should feel hurt. 他感到疼是很正常的。
(2) It be + 过去分词 ＋ that... (should)...。用于该结构中的过去分词是表示“建议、请求、命令”等词的过去分词。如： desired, suggested, requested, ordered, proposed等。例如：
It is desired that the building of the house be completed next month. 真希望这所房子在下个月前就能竣工。
(3) It is time (about time / high time) that... + (过去时或should + 动词原形)...。例如：
It is high time I went home now. = It is high time I should go home. 我该回家了。
(4) 表语从句、同位语从句中的虚拟语气。在suggestion, proposal, order, plan, idea, advice, decision等需要具体内容解释的名词后要使用虚拟语气，其谓语动词为：should + 动词原形，连接从句的that不能省略。例如：
My suggestion is that we should go there at once. 我的建议是我们应该马上去那儿。
4． 省略形式。有时可以把含有助动词、情态动词、be或have的虚拟条件句中的连词if 省去，而将had, should, were 等词提到主语之前，即用倒装结构。这时，如果出现not等否定词时需放在主语后面。例如：
If she had been here five minutes earlier she would have seen her old friend. → Had she been here five minutes earlier she would have seen her old friend. 如果她早到五分钟，她就会看见她的老朋友了。
B. 英语中虚拟语气的用法
在表示假想的虚假的、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版强烈情感时，也用权虚拟语气。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。主要是英语语法的一种表达，与真实语气相对。
C. 英语中的 虚拟语气怎么用
如果你想表达一个虚拟的意思，即非真实的情况那么就要用虚拟语气了。现在的英语中专有三种表虚拟的：一种是属BE型，即用动词原形，二是WERE型，不管主语是什么人称，谓语动词都是用were，还有一种就是混合情况了，比如说it's time that+clause等clause分句中的谓动就要用一般过去时了。像这种特殊的情况还很多，这就要靠自己的积累了。
D. 英语中的虚拟语气
耐心地把这看完，你会对虚拟语气有个透彻的了解。
第一部分：语气的定义和种类
1 语气(mood)
语气是动词的一种形式，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
⑴、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。如：
①There are two sides to every question.每个问题都有两个方面。
②Were you busy all day yesterday?昨天一整天你都很忙吗？
③How good a teacher she is!她是多好的一位老师啊！
⑵、祈使语气：表示说话人对对方的请求或命令。如：
①Never be late again!再也不要迟到了。
②Don’t forget to turn off the light.别忘了关灯。
⑶、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：
①If 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。
②I wish I could pass the examination.我希望我能通过考试。
③May you succeed!祝您成功！
虚拟语气在语法里算得上是个难点。让我们就从最简单的开始吧。
第二部分：简单句中的虚拟语气
一、情态动词的过去式用于现在时态时，表示说话人的谦虚、客气、有礼貌、或委婉的语气，常用于日常会话中。如：
⑴.Would you be kind enough to show me the way to the post office?请你告诉我去邮局的路好吗？
⑵.It would be better for you not to stay up too late.你最好别熬夜到很晚。
二、表祝愿。
1、常用“may+动词原形”表示祝愿，但愿，此时may须置于句首（多用于正式文体中）。
⑴、May good luck be yours!祝你好运！
⑵、May you be happy!祝你快乐！
⑶、May you do even better!祝你取得更大成就！
⑷、May you have a good time. 祝愿你玩的痛快。
⑸、May the friendship between us last long. 祝愿我们的友情天长地久。
⑹、May you be happy. (注意那个be ) 祝你幸福。
2、用动词原形。例如：
(1).Long live the people! 人民万岁！
(2).“God bless you,”said the priest.牧师说：“愿上帝保佑你！”
(3).Have a good journey! 祝愿你旅途愉快！
三、表示强烈愿望。（该类型虚拟语气谓语仅用动词原形，第三人称单数也不加“s”）
(1).God save me．
(2).Heaven help us．
四、表命令
1.命令虚拟语气只能用在第二人称(you)，而且通常省略主语(也就是you)。
2.句子尾通常加上感叹号：！
3.虚拟语气动词用一般现在时态(Simple Present)，如：work, be , go
4.否定形式的命令语气，可用助动词do，加上not。
(1). Work !
(2). Work harder !
(3). Be more alert ! (虚拟语气动词Be)
(4). You go out !
(5). Do not work so hard. (do not 表示否定的虚拟语气)
(6). Don't be afraid. (口语中常用don't 代替do not)
五、在一些习惯表达中。如：
(1).You’d better set off now.你最好现在就出发。
(2).I’d rather not tell you the secret.我情愿不告诉你这个秘密。
第三部分：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)
例题分析：I wish I ______ longer this morning, but I had to get up and come to class.
A. could have slept B. slept C. might have slept D. have slept
动词wish后面接从句，表达不可能实现或与事实相反的情况时，谓语动词要用虚拟语气，即用过去式（表示现在发生的动作）或过去完成式（表示过去发生的动作）。本题后半句谓语动词have用的是过去时had
to get up and come, 所以前面要用过去完成时表示过去发生的动作。所以, 选项A)could have slept是答案
三）、对将来情况的虚拟(表示将来的主观愿望)：
从句动词"would/should/could/might + 动词原形"(时间上较后)(请注意：主句和从句的主语不相同)。用wish表示对将来事情的愿望。例：
1. I wish it would stop raining.(虚拟动词would+动词原形stop)
我希望雨能停止。(事实上雨还在下着呢)
2. I wish you would be quiet.(would + be)
我希望你安静一些。(事实上那家伙还在吵着呢)
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)
4. I wish she would change her mind.(would + change)
我希望她会改变主意。(呵呵，女孩子可没那么容易就改变主意喔)
5. He will wish we would join him the following week.(would + join)
(只是希望我们和他在一起，实际上还没在一起)
四）、注意：
1.如果将wish改为过去式wished, 其后that 从句中的动词形式不变。例如：
I wished I hadn't spent so much money.
我要是那时没有花掉那么多钱就好了。
2. 如果that 从句中用would , 一般表示对现状不满或希望未来有所改变或请求
I wish he would answer my letter.
I wish prices would come down.
I wish you would help me.
I wish you would stop asking silly questions.
二、在表示建议、命令、要求、忠告等动词的后面的宾语从句中的虚拟语气
由于这些动词本身隐含说话者的主观意见，认为某事应该或不应该怎样，这些词语后面的“that”从句应用虚拟语气，且均以“should+动词原形”表示这种语气，但事实上“should”常被省略，故此从句中谓语动词用原形，常用的此类动词有：
表示“要求”的：ask, desire, request, demand, require, beg
表示“提议、劝告、建议”的：move, prpose, suggest, recommend, advise, vote
表示“决定、命令”的：decide, order
表示“主张”的：maintain, urge
表示“同意、坚持”的：consent, insist
例如：
1.The doctor suggested that he (should) try to lose his weight.
2.He insisted that we (should ) tell him the news.
3.When I suggested that he try shaving cream, he said, “The razor and water do the job. ”(当我建议他用刮胡膏时，他说“剃刀和水就行了”。)
4.He pursued various theories for several days until I suggested we take the toy apart to see how it did work. (他费了几天功夫寻找理论根据，直到我建议拆开看看它是如何转动的。)
5.One can suggest that students should spend two or three years in an English
E. 英语虚拟语气详解
1、真实条件状语从句与非真实条件状语从句
------------------------------------------------------------------------ eg . If he doesn’t hurry up, he will miss the bus. 如果他不快点，他将错过巴士。( 真实条件状语)（不是虚拟语气） 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。（真实条件状语）（不是虚拟语气） If I were you, I would go at once.如果我是你，我马上就会去。 （非真实条件状语从句） If there were no air, people would die. 如果没有空气，人就会死亡。（非真实条件状语从句）
2、用法及动词形式
1、表示与现在事实相反的情况： if+主语+过去时+其他+主语+should/would/could/might+do+其他 例： 1.If I were you, I would take an umbrella.如果我是你，我会带把伞。（事实：我不可能是你） 2.If I knew his telephone number, I would tell you. 如果我知道他的电话号码，我就会告诉你。（事实：不知道） 3.If there were no air or water, there would be no living things on the earth. 如果没有水和空气，地球上就不会有生物。(事实：地球上既有空气也有水) 4.If I had any money with me, I could lend you some. 如果我带钱了，我就会借给你些。（事实：没带钱） 5.If he studied harder, he might pass the exam.如果他再努力些，就能通过考试了。（事实：学习不用功） 2、表示与过去事实相反的情况 if+主语+had done +其他+主语+should/would/could/might+have done+其他 例： 1. If I had got there earlier, I should/could have met her. 如果我早到那儿，我就会见到她。（事实：去晚了） 2.If he had taken my advice, he would not have made such a mistake. 如果他听我的劝告的话，就不会犯这样的错误了。（事实：没有听我的话） 3、表示对将来情况的主观推测 ①if+主语+did/should/were to do+sth.+主语+should/would/could/might+do+其他 ② if+主语+did/be(were)+sth.+主语 +should/would/could/might+do+其他 ③if+主语+should+do+sth.+主语 +should/would/could/might+do+其他 例： 1.If he should come here tomorrow, I should/would talk to him. 如果他哪天来这儿的话，我就跟他谈谈。 （事实：来的可能性很小） 2.If there were a heavy snow next Sunday, we would not go skating. 如果下周日下大雪，我们就不能去滑冰了。（事实：不知能否下雪） 3.If she were to be there next Monday, I would tell her about the matter. 如果她下周一来这儿的话，我就会告诉她这件事的始末。 在表示建议、命令、要求等含义的宾语从句，谓语动词常用虚拟语气，"should＋动词原形"构成，should 可省略。 4、 有时，虚拟条件句中，结果主句和条件从句的谓语动作若不是同时发生时，虚拟语气的形式应作相应的调整。 ①从句的动作与过去事实相反，而主句的动作与现在或现在正在发生的事实不符。如： If I had worked hard at school, I would be an engineer, too. 如果我在学校学习刻苦的话，我现在也会成为一个工程师了 If they had informed us, we would not come here now. 如果他们通知过我们的话，我们现在就不会来这里了。 ②从句的动作与现在事实相反，而主句的动作与过去事实不符。如： If he were free today, we would have sent him to Beijing. 如果他今天有空的话，我们会已经派他去北京了。 If he knew her, he would have greeted her. 要是他认识她的话，他肯定会去问候她了。 ③从句的动作与过去发生的情况相反，而主句的动作与现在正在发生的情况相反。如： If it had not been raining too much, the crops would be growing much better. 如果天不下太多的雨的话，庄家会长得更好。 If he had been working hard, he would be working in the office now. 要是他工作一直努力的话，他现在已进了办公室了。 5、 当虚拟条件句的谓语动词含有were, should, had时，if可以省略，这时条件从句要用倒装语序，即将were, should, had等词置于句首，这种多用于书面语。如： Should he agree to go there, we would send him there. 要是他答应去的话，我们就派他去。 Were she here, she would agree with us. 如果她在这儿的话，她会同意我们的。 Had he learnt about computers, we would have hired him to work here. 如果她懂一些电脑知识的话，我们会已经聘用他来这里工作了。 6、非真实条件句中的条件从句有时不表达出来，只暗含在副词、介词短语、上下文或其他方式表示出来，这种句子叫做含蓄条件句，在多数情况下，条件会暗含在短语中，如without…., but for….等 But for his help, we would be working now. 要不是他的帮助，我们还会在工作呢。 Without your instruction, I would not have made such great progress. 要是没有你的指导，我不会取得如此大的进步。 We didn’t know his telephone number; otherwise we would have telephoned him. 我们不知道他的电话号码，否则我们就会给他打电话。 7、 有时，虚拟条件句中，主、从句可以省略其中的一个，来表示说话人的一种强烈的感情。 ①省略从句 He would have finished it. 他本该完成了。 You could have passed this exam. 你应该会通过这次考试了。 ②省略主句 If I were at home now. 要是我现在在家里该多好啊。 If only I had got it. 要是我得到它了该多好啊。、
编辑本段虚拟语气（Subjective Mood)的其他用法
1、虚拟语气用在wish 后的宾语从句
a、表示与现在事实相反的愿望，谓语动词用过去式 eg. I wish I had your brains.我希望我有你那样的头脑。(事实：我根本比不上你) b、表示与过去事实相反的愿望，谓语动词：had+done(动词过去分词） eg:.I wish I had known the truth of the matter.我希望我原来知道这件事的真相。（事实：原来不知道） c、表示将来难以实现的愿望 谓语动词：should/would + 动词原形 eg. I wish I should have a chance again.我希望我还能有一次这样的机会。（事实：很难再有这样的机会了） (注：if only和as if/as though也有相同用法）
2、虚拟语气用在目的状语从句中
1.在for fear that, in case, lest引导的，若用虚拟语气时，从句谓语为：should + 动词原形。并且 should不能省略 She examined the door again for fear that a thief should come in. 她又把门检查了一遍，以防盗贼的进入。 He started out earlier lest he should be late. 他很早就出发了以防迟到。 2、在so that, in order that所引导的目的状语从句中，从句中的谓语为：can / may / could / might / will / would / should + 动词原形。 He goes closer to the speaker so that he can hear him clearer. 他走近说话的人以便能挺得更清楚。 He read the letter carefully in order that he should not miss a word. 他把信读得很仔细以便不漏掉一个单词。
3、虚拟语气的其他用法
1、一想要(desire)二宁愿(prefer)三命令(order. command)四建议(advise. suggest. propose)五要求(demand. require. request. desire.insist)中，无论主句谓语动词为何种时态，从句的谓语动词都用：“should + 动词原形”或只用“动词原形”。 如 He suggested that we (should) take the teacher’s advice He insisted that we (should) take the teacher’s advice He demand that we (should) take the teacher’s advice He ordered that we (should) take the teacher’s advice 注：insist如果翻译成坚持某种动作才用虚拟语气翻译成坚持某种观点就不用虚拟语气。 如：He insist he is a student. 他坚持说他是个学生。 这个语句表示的是事实，因此在这个语句中不能使用虚拟语气。 suggest意为“建议”才用虚拟语气，意为“暗示”则不用虚拟语气。 如： His face suggests that he looks worried .他的表情暗含着他很担心。 这个句子本身是事实，因此它就没有用到虚拟语气。 ③表情绪.观点的形容词或名词也要用虚拟语气.如:necessary. important. impossible. natural. strange. surprising. funny. right. wrong. better. a pity等。 句型：It is.......that 结构后的主语从句，从句的谓语动词都要用 should+原型 或只用动词原型。 ④虚拟语气在方式状语从句的应用。详网络之方式状语从句词条。 2、 在even if, even though 所引导的让步状语从句中，可用虚拟语气，主句、从句的结构与if所引导的条件从句结构相同。如： Even if he were here himself, he should not know what to do. 即使他亲自来也不知该怎么办。 Nobody could save him even though Hua Tuo should come here. 即使华佗在世也救不了他。 3、 在whatever，whichever，whenever，whoever, wherever，however, no matter wh-word 等引导的让步状语从句中，从句虚拟语气结构为： ① may +动词原形(指现在或将来)。如： We will finish it on time no matter what / whatever may happen. 不管发生什么事，我们都要按时完成。 We will find him wherever / no matter where he may be. 无论他在哪里，我们都要找到他。 I will wait for him no matter how late he may come. 不管他来的多么晚，我都会等他。 ② may +完成式(指过去) ，主句结构不限。如： You mustn’t be proud whatever / no matter what great progress you may have made. 不管你取得了多么大的进步，你也不能骄傲 We must respect him no matter what / whatever mistakes he may have made. 不管他犯过什么错误，我们必须尊敬他。 4、一般would rather, had rather, would sooner等之后的宾语从句常表示与客观事实不相符的一种愿望，故使用虚拟语气。其虚拟语气的结构为： 表示所发生的时间虚拟语气结构 过去 had + 过去分词； 现在 过去时(be 用were ) 将来 过去时(be 用were ) 如：I’d rather you had seen the film yesterday. 我倒想你昨天看过了这场电影。 I’d rather you were here now. 我倒想你现在在这儿。 We’d rather you went here tomorrow. 我们倒想你明天去那儿 5、虚拟语气还可用在定语从句中，表示：“早该做某事了”时，定语从句中的谓语动词须用虚拟语气，其虚拟语气的结构为：It is (high / about) time that + 主语+ 动词的过去式/ should + 动词原形，即从句用虚拟过去式。 如It is time that I went to pick up my daughter at school. 我该去学校接我的女儿了。 It is high time you should go to work. 你早该上班了。 6、 简单句中的虚拟语气 （1） 说话时，为了表示客气、谦虚、委婉而有礼貌，言语常使用虚拟语气。其虚拟语气的结构形式常为：would / could / might / should + 原形动词。如： Would you mind my shutting the door? 我把门关起来你介意吗？ You should always learn this lesson by heart. 你要把这个教训牢记于心。 I should agree with you. 我应该同意你的观点。 （2） 表示“祝愿”时，常用“may + 主语+ 动词原形+ 其他”。如： May you have a good journey! 祝你一路顺风。 May your youth last for ever! 祝你青春永驻。 （3）表示强烈的“愿望”、“祝愿”时，常用动词原形。如： Long live the Communist Party of China. 中国共产党万岁。 God bless us. 上帝保佑。 （4） 习惯表达中常用的虚拟语气。 (1) 提出请求或邀请。如： Would you like to have a talk with us this evening? 今天晚上来跟我们聊天好吗？ Could I use your bike now? 我可以用一下你的单车吗？ (2) 陈述自己的观点或看法。如： I should glad to meet you. 见到你我会很高兴。 I would try my best to help you. 我会尽力帮助你。 (3) 提出劝告或建议。如： You’d better ask your father first. 你最好先问一问你的父亲。 You should make a full investigation of it first. 你应该先全面调查一番。 (4) 提出问题。如： Do you think he could get here on time? 你认为他能按时来吗？ Do you expect he would tell us the truth? 你期望他会告诉我们真相吗？ (5) 表示对过去情况的责备时，常用虚拟语气。其虚拟语气的结构为：“情态动词 + have + 过去分词”。如： You should have got here earlier. 你应该早就到这里了。 You should have returned it to him. 你应该把他还给他了。引
F. 英语中虚拟语气的详解。。。 谢谢
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。
虚拟语气常在表示条件和结果的状语从句中。在表示与事实相反的虚拟语气时动词有三种时态：现在时，过去时，将来时，过去完成时，现在完成时。 在条件句中的应用：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的或实际可能性不大的情况，故采用虚拟语气。 虚拟语气
在什么情况下用虚拟语气? 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，表示主观愿望或表示某种强烈情感时，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。
虚拟语气在非真实条件状语从句中的用法
1、真实条件状语从句与非真实条件状语从句
------------------------------------------------------------------------ eg . If he doesn’t hurry up, he will miss the bus. 如果他不快点，他将错过巴士。( 真实条件状语)（不是虚拟语气） 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。（真实条件状语）（不是虚拟语气） If I were you, I would go at once.如果我是你，我马上就会去。 （非真实条件状语从句） If there were no air, people would die. 如果没有空气，人就会死亡。（非真实条件状语从句）
2、用法及动词形式
1、表示与现在事实相反的情况： if+主语+过去时+其他+主语+should/would/could/might+do+其他 例： 1.If I were you, I would take an umbrella.如果我是你，我会带把伞。（事实：我不可能是你） 2.If I knew his telephone number, I would tell you. 如果我知道他的电话号码，我就会告诉你。（事实：不知道） 3.If there were no air or water, there would be no living things on the earth. 如果没有水和空气，地球上就不会有生物。(事实：地球上既有空气也有水) 4.If I had any money with me, I could lend you some. 如果我带钱了，我就会借给你些。（事实：没带钱） 5.If he studied harder, he might pass the exam.如果他再努力些，就能通过考试了。（事实：没有努力 2、表示与过去事实相反的情况 if+主语+had done +其他+主语+should/would/could/might+have done+其他 例： 1. If I had got there earlier, I should/could have met her. 如果我早到那儿，我就会见到她。（事实：去晚了） 2.If he had taken my advice, he would not have made such a mistake. 如果他听我的劝告的话，就不会犯这样的错误了。（事实：没有听我的话） 3、表示对将来情况的主观推测 ①if+主语+were to do+sth.+主语+should/would/could/might+do+其他 ② if+主语+did/be(were)+sth.+主语 +should/would/could/might+do+其他 ③if+主语+should+do+sth.+主语 +should/would/could/might+do+其他 例： 1.If he should come here tomorrow, I should/would talk to him. 如果他哪天来这儿的话，我就跟他谈谈。 （事实：来的可能性很小） 2.If there were a heavy snow next Sunday, we would not go skating. 如果下周日下大雪，我们就不能去滑冰了。（事实：不知能否下雪） 3.If she were to be there next Monday, I would tell her about the matter. 如果她下周一来这儿的话，我就会告诉她这件事的始末。 在表示建议、命令、要求等含义的宾语从句，谓语动词常用虚拟语气，"should＋动词原形"构成，should 可省略。 4、 有时，虚拟条件句中，结果主句和条件从句的谓语动作若不是同时发生时，虚拟语气的形式应作相应的调整。 ①从句的动作与过去事实相反，而主句的动作与现在或现在正在发生的事实不符。如： If I had worked hard at school, I would be an engineer, too. 如果我在学校学习刻苦的话，我现在也会成为一个工程师了 If they had informed us, we would not come here now. 如果他们通知过我们的话，我们现在就不会来这里了。 ②从句的动作与现在事实相反，而主句的动作与过去事实不符。如： If he were free today, we would have sent him to Beijing. 如果他今天有空的话，我们会已经派他去北京了。 If he knew her, he would have greeted her. 要是他认识她的话，他肯定会去问候她了。 ③从句的动作与过去发生的情况相反，而主句的动作与现在正在发生的情况相反。如： If it had not been raining too much, the crops would be growing much better. 如果天不下太多的雨的话，庄稼会长得更好。 If he had been working hard, he would be working in the office now. 要是他一直努力工作的话，他现在已进了办公室了。 5、 当虚拟条件句的谓语动词含有were, should, had时，if可以省略，这时条件从句要用倒装语序，即将were, should, had等词置于句首，这种多用于书面语。如： Should he agree to go there, we would send him there. 要是他答应去的话，我们就派他去。 Were she here, she would agree with us. 如果她在这儿的话，她会同意我们的。 Had he learnt about computers, we would have hired him to work here. 如果她懂一些电脑知识的话，我们已经聘用他来这里工作了。 6、非真实条件句中的条件从句有时不表达出来，只暗含在副词、介词短语、上下文或其他方式表示出来，这种句子叫做含蓄条件句，在多数情况下，条件会暗含在短语中，如without…., but for….等 But for his help, we would be working now. 要不是他的帮助，我们还会在工作呢。 Without your instruction, I would not have made such great progress. 要是没有你的指导，我不会取得如此大的进步。 We didn’t know his telephone number; otherwise we would have telephoned him. 我们不知道他的电话号码，否则我们就会给他打电话。 7、 有时，虚拟条件句中，主、从句可以省略其中的一个，来表示说话人的一种强烈的感情。 ①省略从句 He would have finished it. 他本该完成了。 You could have passed this exam. 你应该能通过这次考试了。 ②省略主句 If I were at home now. 要是我现在在家里该多好啊。 If only I had got it. 要是我得到它了该多好啊。、
。。。。。。。。。。。
等等 ，详见网络“虚拟语气”
G. 虚拟语气在考研英语阅读理解中怎么理解
虚拟语气，是指在一些场合里，当说话者谈到自己的愿望时，主观想像某些回事有可能发生时，或建答议、要求某些事发生时，而面对却与实际情况相反的情况，就需要借助于虚拟语气来表达他的这些心态。
虚拟从句中最主要的一种就是非真实条件从句，它是用来描述说话人想象的、非真实的情景，这些情景通常是不可能发生的，与客观实际相反的，或发生可能性极小，只表示说是说话人的一种主观愿望、假想和建议等等。
一是我们知道与现在事实相反，if从句的谓语形式用did or were, 主句的谓语形式为would(should, might, could)+do;
二是与过去事实相反，从句用had done or had been ,主句则为would(should, might, could)+have done/been;
三是与将来事实相反，从句用were to do/should do,主句则用would(should, might, could)+do。
这三种最基本的虚拟语气，其if从句中谓语动词表示的动作与主句谓语动词表示的动作发生的时间是一致的，即同为现在、过去或将来。
可以做做何凯文的 考研英语绝对考场最后六套题
H. 高考英语虚拟语气用法总结
一.概念: 动词虚拟语气表示说话人的愿望, 假设, 猜测, 建议, 请求, 意图, 设想等未能或不可能成为事实的情况, 或者在说话人看来实现可能性很小的情况, 而不表示客观存在的现实
二.虚拟语气的表现形式: 通过句中谓语动词的特殊形式来表现. 这些特殊形式与谓语动词的某些时态相同, 但它们只表示语气, 而不表示时态, 但含有一定的时间概念
虚拟语气的用法
一.虚拟语气在简单句中的用法: 谓语动词用原形或may +动词原形
1.表示祝愿
a. Long live our country.
b. May you succeed.
c. May you be happy all your life.
2.表示命令
a. Everybody leave the room.
二.虚拟语气在非真实条件句中的用法: (使用虚拟语气的含条件句的复合句称为真实条件句)
1.表示与现在事实相反的情况时, if从句的谓语用动词的过去式 (be动词的过去式多用were, 而不用was), 主句的谓语用should / would / could / might +动词原形 (should多用于第一人称, would多用于二三人称, could / might可用于所有人称)
a. If I had more time, I should study computer better.
b. If he were not so busy, she would attend the meeting this afternoon.
c. If they didn’t take exercises every day, they wouldn’t be so healthy.
d. If you went to bed earlier, you would not be so sleepy in the morning.
e. If she invited me, I should go to the party.
2.表示与过去事实相反的情况时, if从句的谓语用had done形式, 主句的谓语用should / would / could / might + have done的形式
a. If she had invited me yesterday, I should have gone to the party.
b. I would have checked my paper again if I had had more time at yesterday’s exam.
c. If you had taken the teacher’s advice, you would not have failed in the exam.
3.表示与将来事实相反的情况时, if从句的谓语形式是: ①.完全动词过去式 (be的过去式通常用were); ②.should +动词原形; ③.were to do. 其中②, ③种情况都含有出乎意料之外之意; 主句的谓语的形式是: should / would / could / might +动词原形
a. If she should invite me tomorrow, I should go to the party.
b. If it rained / should rain / were to rain tomorrow, our picnic would be put off.
c. If I saw him tomorrow, I would pass your note to him.
d. I might come back if I were to miss the train.
三.虚拟语气在非真实条件句中用法的几个变体:
1.条件从句省略if: 在书面语中, 如果条件从句中的谓语中有were, had, should等词, 可将if省略, 而把were, had, should放在句首
a. Were I you (=If I were you ), I would get up early very early.
b. Had you arrived (=If you had arrived ) at the station ten minutes earlier yesterday, you could have caught the train.
2.省略条件从句或主句, 省略部分的含义仍有所体现. 省略主句时, 表示己不能实现的愿望
a. You could have done it yourself (if you had wanted to).
b. I wouldn’t smoke (if I were you).
c. If my old friends were with me! (要是老朋友和我在一起该多好啊)
d. If you could have seen the wonderful film!
3.主从句时间不一致时, 主从句谓语动词的形式取决于要表示的具体时间
a. You would speak English well if you had practised speaking it every day.
b. If she hadn’t trained so hard, she wouldn’t be able to run so fast.
4.假设的条件不以条件从句, 而以其他方式如介词短语、从句等表达出来, 这种句子称为含蓄条件句
a. What would you do with a million dollars?
b. Without music, the world would be a ll place.
c. We could have done better with more money.
d. He would have given you more help, but he has been so busy.
四.虚拟语气在as if / though从句中的用法:
1.表示与现在事实相反或对相在情况有所怀疑, as if / though从句谓语用过去式
a. He speaks English so well as if she had studied English in England.
b. She looked as if she were ill.
2.表示与过去事实相反的情况, as if / though从句谓语用过去完成式
a. The machines operated as if it had been repaired.
五.虚拟语气在含even if / though从句的复合句中的用法:
在此类复合句中, 若表示与事实相反, 可用虚拟语气形式. 主从句的谓语动词形式与非真实条件句相同
a. Even if I were rich, I would work.
六.虚拟语气在主语从句中的用法:
如果表示说话人的看法, 想法或意见, 在句型 It is / was + adj. + that从句中, 主语从句中可用虚拟语气. 主语从句中谓语动词用should do表示现在或将来情况, 用should have done表示过去情况
a. It is necessary that you should clean the lab before you left.
b. It is important that you should take the doctor’s advice.
c. It was very strange that he should have left without say goodbye.
七.虚拟语气在宾语从句中的用法:
1.在wish的宾语从句中, 通常表示不可能实现或没有实现的愿望, 常用虚拟语气
①.wish的宾语从句用过去式, 表示现在或将来没有实现或不可能实现的愿望
a. I wish I knew the result of the match now.
b. I wish it were spring here all the year round.
c. I wish I could help you.
d. I wish I were young.
②.wish的宾语从句用过去完成式, 表示过去没有实现或不可能实现的愿望
a. We wish we had got the film tickets last night.
b. I wish you I had met him yesterday.
③.wish的宾语从句若用would, 则一般表示请求, 对现状不满或希望未来有所改变
a. I wish the prices would come down.
b. I wish you would help me.
c. I wish he would be more careful.
d. We wish you would spend the holiday with us.
2.在动词suggest (建议), advise (建议), demand (要求), require (要求), order (命令), insist (坚持)后的宾语从句中, 谓语动词常用( should )+动词原形的虚拟语气形式
a. I suggested that we should go there at once.
b. I demand that he should answer me at once.
c. The doctor insisted that the patient should stay in bed for two weeks.
d. The officer ordered that the soldiers should stop playing.
与名词suggestion建议 / advice 建议 / demand要求 / request要求 / order命令有关的从句(包括同位语从句和表语从句等)中的谓语也用 ( should ) +动词原形
a. The black people made a strong demand that the government ( should ) take steps to change the unfair situation.
b. Their demand is that the government should take steps to change the unfair situation.
c. I was Bill’s suggestion that everybody should have a map.
d. His suggestion was that everybody should have a map.
八.虚拟语气用在句型: It is time that(该做某事了)中: that从句中的谓语动词用过去式
a. It is time we got up.
九.虚拟语气用在if only引导的感叹句中: 表示但愿, 要是就好了, 其中谓语形式与wish的宾语从句相同
a. If only he didn’t drive so fast! ( =I wish he didn’t drive so fast.)
b. If only he had taken the doctor’s advice. ( =I wish he had taken the doctor’s advice.)
c. If only the rain would stop! ( =I wish the rain would stop.)
十.虚拟语气用在would rather / prefer后的that从句中: 表示现在或将来情况谓语动词用过去时形式, 表示过去情况动词用过去完成时形式
a. I would rather he came next Saturday.
b. I would prefer you had seen the film yesterday.
c. I would rather that he painted the house blue
I. 英语里的虚拟语气是怎样的
指我们平常说的说话人说话的口气。（在英语中，语气除了指语调以外，最主要的是通过动词发生变化而表示不同语气）
英语中的语气分为三类：
陈述语气（用于陈述句、疑问句、感叹句）
祈使语气（用于祈使句）
虚拟语气（用于条件状语从句、宾语从句等）
二、虚拟语气
1） 虚拟语气概念
虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实，或与事实相反。
2） 在条件句中的应用
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的或实际可能性不大的情况，故采用虚拟语气。
三、虚拟语气在非真实条件状语从句中的用法
1、真实条件状语从句与非真实条件状语从句
eg If he doesn’t hurry up, he will miss the bus. ( 真实条件状语)
If he was free, he would ask me to tell stories. （真实条件状语）
If I were you, I would go at once. （非真实条件状语从句）
If there was no air, people would die. （非真实条件状语从句）
2、虚拟语气在非真实条件状语从句中的用法及动词形式
① 表示与现在事实相反的情况
（条件）从句谓语动词形式
主句谓语动词形式
谓语动词用过去式
（be用were）
should/would/could/might+动词原形
eg：If I were you, I’d take an umbrella.如果我是你，我会带把伞。（事实：我不可能是你）
If I knew his telephone number, I would tell you. 如果我知道他的电话号码，我就会告诉你。（事实：不知道）
If there were no air or water, there would be no living things on the earth. 如果没有水和空气，地球上就不会有生物。(事实：地球上既有空气也有水)
If I had any money with me, I could lend you some. 如果我带钱了，我就会借给你些。（事实：没带钱）
If he studied harder, he might pass the exam.如果他在努力些，就能通过考试了。（事实：学习不用功）
②表示与过去事实相反的情况
从句谓语动词形式
主句谓语动词形式
Had+过去分词
Should/would/could/might+have+过去分词
eg If I had got there earlier, I should/could have met her. 如果我早到那儿，我就会见到她。（事实：去晚了）
If he had taken my advice, he would not have made such a mistake. 如果他听我的劝告的话，就不会犯这样的错误了。（事实：没有听我的话）
③表示对将来情况的主观推测（可能相反或可能性很小）
从句
主语例句
If+主语+
① should+动词② did
③were to do
(①通常与一个表示时间状语连用)其 中were to do可能性最小，
should/would/could/might+动词原形If it rained tomorrow our picnic
would be put off.
万一那天下雨，我们的郊游
就推迟。
eg: If he would come here tomorrow, I should/would talk to him. 如果他哪天来这儿的话，我就跟他谈谈。（事实：来的可能性很小）
If there were a heavy snow next Sunday, we would not go skating. 如果下周日下大雪，我们就不能去滑冰了。（事实：不知能否下雪）
If she were to be there next Monday, I would tell her about the matter. 如果她下周一来这儿的话，我就会告诉她这件事得始末。
四、虚拟语气的其他用法
①、虚拟语气用在wish 后的宾语从句
a、表示与现在事实相反的愿望，谓语动词用过去式
eg: I wish I had your brains.我希望我有你那样的头脑。(事实：我根本比不上你)
b、表示过去事实相反的愿望，谓语动词：had+v-ed
eg: I wish I had known the truth of the matter.我希望我原来知道这件事的真相。（事实：原来不知道）
c、表示将来难以实现的愿望
谓语动词：should/would + 动词原形
eg: I wish I should have a chance again.我希望我还能有一次这样的机会。（事实：很难再有这样的机会了）
②虚拟语气用在suggest(建议)、insist(坚持)、demand(要求)、order(命令)等动词后的宾语从句中。
在这种用法中，无论主句谓语动词为何种时态，从句的谓语动词都用：“should + 动词原形”或只用“动词原形”。
如 He suggested that we (should) take the teacher’s advice
He insisted that we (should) take the teacher’s advice
He demand that we (should) take the teacher’s advice
He ordered that we (should) take the teacher’s advice