1.高中英语虚拟语气的全部知识点
虚拟语气的主要知识点，供你参考
1、表示与现在事实相反的情况：
从句：主语+过去时
主句：主语+should/would/could/might+do
eg:
If I were you,I would take an umbrella.如果我是你，我会带把伞.
2、表示与过去事实相反的情况
从句：主语+had+done
主句：主语+should/would/could/might+have done
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.
3、表示对将来情况的主观推测
从句：主句
①if+主语+were to do ：①主语+should/would/could/might+do
②if+主语+did/were ②主语+should/would/could/might+do
③if+主语+should+do ③主语+should/would/could/might+do
eg:
①.If he should come here tomorrow,I would talk to him. 如果他明天来这儿的话，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 here 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.
2.英语虚拟语气知识归纳
虚拟语气是一种动词形式，表示说话人的一种愿望，假设，怀疑，猜测，建议等含义，虚拟语气所表示的含义不是客观存在的事实。
If I were you, I’d take them away. 如果我是你的话，我就会带走他们。 If I had met Li Hua, I could had told him. 如果我碰见了李华，我就告诉他了。
If I had time. I could come to help you. 如果我有时间，我会来帮助你的。 He suggested that our class should be divided into five groups. 他建议说我们的班应该分成五个小组。
He speaks to us as if he had been there. 他给我们讲的好象他去过那儿。 虚拟语气的用法 1） 虚拟语气用在简单句中，表示祝愿，命令。
May you be happy. 祝你幸福。 May you have a good time. 祝愿你玩的痛快。
May the friendship between us last long. 祝愿我们的友情天长地久。 Have a good journey！ 祝愿你旅途愉快！ You go out！ 你出去！ 2） 虚拟语气用在宾语从句中。
动词 wish, suggest,order,insist, propose，等词后面的宾语从句表示的是一种虚拟语气，宾语从句中的动词动作表示的只是一种愿望、要求。 I wish she would be on my side. 我希望她能站在我一边。
I wish I could help him. 我希望我能帮助他。 He insisted that all of us should be there on time by any means. 他坚持要我们大家想尽办法按时去那儿。
动词 demand, suggest, order, insist, propose 后面的从句中，”should” 可以省略。 The teacher suggested that we (should) clean the blackboard after class. 老师建议我们课后把黑板擦了。
He ordered that the students wash the clothes every week by themselves. 他要求学生每周都要自己洗衣服。 3） 虚拟语气用在主语从句中。
在句型 “It is important (necessary, strange, natural) that 。. ” 中，that 后面的从句中的谓语动词用： should + 动词原形 It’s necessary that we should have a walk now. 我们有必要出去散散步。
It’s natural that she should do so. 她这样做是很自然的。 It’s important that we should take good care of the patient. 重要的是我们要照顾好病人。
4） 虚拟语气用在状语从句中。 虚拟语气最多地用在表示条件的状语从句和表示结果的从句中。
在表示与事实相反的虚拟语气时，动词有三种时态形式，即现在、过去和将来。 A.与现在事实相反的： If I (we,you,he,they)+ 动词过去式.. if I (he,she) were。
I (we) should + 动词原形。 He (you,they) would + 动词原形。
B.与过去事实相反的： If I(we,you,he,they)+ had + 过去分词 I(we)should + have+ 过去分词。He (you,they) would + have + 过去分词。
If I were you, I should buy it. 如果我是你，我就买了它。 If I had time, I would study French. 如果我有时间，我会学习法语的。
If she knew English,she would not ask me for help. 如果她懂英语的话，她不会找我帮忙的。 If you had got up earlier, you could have caught the train. 如果你早一点起床，就会赶上火车的。
If it were fine tomorrow,I would go shopping. 如果明天天气好，我就去买东西。 ***有关虚拟语气的几个问题*** 1） 有时if引导的状语从句可以省略 if，而把从句中的动词 were, had 或 should 移到主语前面。
Were she younger, she would do it . 如果她年青点， 她就会干的。 Had he known her address, he would had gone to visit her. 如果他知道她的地址，他会去看她的。
2） 有时表示虚拟语气的条件从句或者主句都可以省略，而只剩下一个主句或者一个条件从句。 I could help you. 我本来可以帮助你。
If I had time. 我要有时间该多好啊！ She should have come to the party. 她应该来参加聚会。 If he had much more money. 如果他有更多的钱就能。
3） 虚拟语气中，条件从句的动词动作可以和主句的动词动作时态不一致。
If they had studied hard, they could do it easily now. 如果他们以前努力学习的话，现在干的就会容易些。 If he had not taken my advice, he wouldn’t do it much better like this. 如果他不听取我的建议，他就不会干得这样好。
3.虚拟语气知识点
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。
[编辑本段]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）（不是虚拟语气） If he was free, he would ask me to tell stories. （真实条件状语）（不是虚拟语气） If I were you, I would go at once. （非真实条件状语从句） If there were no air, people would die. （非真实条件状语从句） 总结就是 四个字：主将从现，主句用将来时，从句用一般现在时。 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 谓语动词用一般过去式 （be用were） should/would/could/might+动词原形（过去将来时） eg. 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） 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（过去完成时） Should/would/could/might+ have+过去分词（现在完成将来时） 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。
[编辑本段]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 ③虚拟语气在方式状语从句的应用。
详百度百科之方式状语从句词条，已经讲的很清楚，这里就不粘贴了。
4.英语虚拟语气的知识点
一、与现在事实相反若与现在事实相反，虚拟语气的条件从句的谓语用过去式（be通常用were），主句谓语用“should (would, could, might)+动词原形”。
如：If you took a taxi,you’d get there quicker. 如果你坐出租车去，你可以快一点到那里。（但你不坐）If I knew her number I could ring her up. 要是我知道她的电话号码，我就可以给她打电话了。
（可惜我不知道）二、与过去事实相反若与过去事实相反，虚拟语气的条件从句的谓语用过去完成时（had+过去分词），主句谓语用“should (would, could, might)+have+过去分词”。如：If I’d left sooner,I’d have been on time. 要是我早点动身，我就准时到了。
（但我动身太迟了）If we had found him earlier we could have saved his life. 要是我们当时早点找到他的话，我们就可以救活他。（可惜我们找到他太晚了）三、与将来事实相反若与将来事实相反，条件从句的谓语用过去式（be通常用were），主句谓语用“should (would, could, might)+动词原形”。
如：If he went,would you go too？ 如果他去，你也去吗？（大概他不会去）If I asked him,I’m sure he’d help us. 如果我向他提出要求，肯定他会帮助我们。（不过我不打算这样做） 注意与说明：对于与将来事实相反的情形，请注意以下几点：一是这里说的与将来事实相反，实为对将来情况的推测；二是此用法中的条件从句谓语除用过去式外，有时也用“should+动词原形”（表示可能性极小，常译为“万一”）或“were to+动词原形”（表示与将来事实相反的假设）；三是当条件从句使用“should+动词原形”这样的谓语时，主句谓语除可用“should (would, could, might)+动词原形”这样的虚拟语气外，也可用陈述语气或祈使语气。
如：I should see him, I’ll tell him. 万一我见到他，我就告诉他。If it should rain tomorrow, don’t expect me. 万一明天下雨，就别等我了。
5.虚拟语气知识点
虚拟语气是英语三级考试的必考知识点之一，也是体现英汉语言习惯区别的一个语法现象。在汉语里表示假设虚拟的情况常用一些虚词来表示，例如“假设”、“如果”等等；而英文中表示虚拟的情况不但有虚词的提示，谓语动词也要相应的变化。
虚拟语气的基本作用是：
1. 表达假设的情况，与事实相反；
2. 表达异想天开很难实现的愿望；
3. 表达建议、命令、劝告等语气。
本节重在讲解if引导的虚拟条件句， 含蓄条件句，特殊结构中的虚拟语气，以及should+动词原形的用法。
一、虚拟语气的基本形式和用法
虚拟（条件）语气中，主句与从句中谓语动词的形式可分为下面三类：
假设类型条件从句谓语动词形式主句谓语动词形式
与现在事实相反If+动词的过去式
(be用were而不用was)would（第一人称可用should）+动词原形
与过去事实相反If+had+-ed分词would（第一人称可用should）+have+-ed分词
与将来事实可能相反If+were to+动词原形或
If+should+动词原形would（第一人称可用should）+动词原形
6.高中虚拟语气的知识点
高中英语虚拟语气知识点1）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。
虚拟语气在条件句中应用比较多。 2）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。 16.1 真实条件句用于陈述语气，假设的情况有可能发生。
各种结构参见下表： 句 型 条件从句 主句 一般现在时 shall/will + 动词原形 祈使句 情态动词一般现在时 例如：If he comes, he will bring his violin. 如果他来，会带小提琴来的。 典型例题 The volleyball match will be put off if it ___. A. will rain B. rains C. rained D. is rained 答案B。
真实条件句主句为将来时，从句用一般现在时。 注意： 1）在真实条件句中，主句不能用be going to表示将来，该用shall, will. （错） If you leave now, you are never going to regret it. （对） If you leave now, you will never regret it. 2）表示真理时，主句谓语动词不用shall (will) +动词原形，而直接用一般现在时的动词形式。
16.2 非真实条件句 1）虚拟语气可以表示过去，现在和将来的情况，时态的基本特点是时态往后推移。 a. 与现在事实相反的假设 条件从句 主句 一般过去时（be用were） should(would)等 +动词原形 例如：If they were here, they would help you. 如果他们在这儿，会帮助你的。
含义：They are not here, they can’t help you. b. 与过去事实相反的假设 条件从句 主句 过去完成时 should(would)等+ have+ 过去分词 例如：If he had come yesterday, I should / would have told him about it.如果他昨天来的话，我会把这件事告诉他的。 含义：He did not come yesterday, so I did not tell him about it. c. 表示对将来不大可能发生的事情的假想 条件从句 主句 一般过去时 should/would等 + 动词原形 were+ 不定式 should+ 动词原形 例如：If you succeeded, everything would be all right. 如果你将来成功了，一切都会好的。
If you should succeed, everything would be all right. If you were to succeed, everything would be all right. 含义：You are not likely to succeed, everything will be what it is now. 16.3 混合条件句 有时，主句与从句的动作发生在不同的时间，主句从句谓语动词的虚拟语气形式因时间不同而不同，这种条件句叫做混合条件句。例如： If you had asked him yesterday, you would know what to do now. 如果你昨天问过他，今天就知道做什么了。
（从句与过去事实相反，主句与现在事实相反。） If it had rained last night（过去）， it would be very cold today （现在）.如果昨晚下过雨，今天就会很冷了。
16.4 虚拟条件句的倒装 虚拟条件句的从句部分含有were, should， 或had时， 可省略if，再把were, should或had 移到从句的句首，实行倒装。例如： Were they here now, they could help us. =If they were here now, they could help us.他们现在在的话，就会帮助我们了。
Had you come earlier, you would have met him. =If you had come earlier, you would have met him.你来得早一点，就碰到他了。 Should it rain, the crops would be saved. =Were it to rain, the crops would be saved.假如下雨，庄稼就有救了。
注意：在虚拟语气的从句中，动词null,null,“benull,null，“的过去时态一律用null,null,”werenull,null，”，不用was，即在从句中be用were代替。例如： If I were you, I would go to look for him. 如果我是你，就会去找他。
If he were here, everything would be all right. 如果他在这儿，一切都会好的。 典型例题 _____ to do the work, I should do it some other day. A. If were I B. I were C. Were I D. Was I 答案C. 在虚拟条件状语中如果有were, should, had这三个词，通常将if省略，主语提前， 变成 were, should, had +主语的形式。
但要注意，在虚拟条件状语从句中，省略连词的倒装形式的句首不能用动词的缩略形式。如我们可说 Were I not to do， 而不能说 Werennull,null,“t I to do。
16.5 特殊的虚拟语气词should 1）在主语从句中的应用 It is demanded / necessary / a pity + that…等结构的主语从句，谓语动词用should 加动词原形，should 可省略。 It is 可用的词有三类 that (should)do suggested, ordered, required, proposed, demanded, requested, insisted等 important, necessary, natural, imperative, strange等 a pity, a shame, no wonder等2）在宾语从句中的应用 在表示命令、建议、要求等一类动词后面的从句中，像order, suggest, propose, require, demand, request, insist, command, insist + (should) do等。
例如： I suggest that we (should) hold a meeting next week. 我建议下周召开个会议。 He insisted that he (should ) be sent there.他要求被派到那儿去。
注意：如suggest, insist不表示null,null，”建议null,null，” 或null,null，”坚持要某人做某事时null,null，”，即它们用于其本意null,null，”暗示、表明null,null，”、null,null，”坚持认为null,null，”时，宾语从句用陈述语气。 判断改错： （错） You pale face suggests that you(should)be ill. （对） Your pale face suggests that you are ill. 。
7.虚拟语气的总结
虚拟语气用法小结1 虚拟语气是一种动词形式，表示说话人的一种愿望，假设，怀疑，猜测， 建议等含义，虚拟语气所表示的含义不是客观存在的事实。
1. 非真实条件句 1）时态：可以表示过去，现在和将来的情况。它的基本特点是时态退后。
a. 同现在事实相反的假设。 句型 ： 条件从句一般过去时+主句would/might/should(should 仅用于第一人称) +动词原形 If they knew that Soot was ill and we used the money to take him to the vet, (they would understand why the house was in a mess). b. 表示于过去事实相反的假设。
句型： 条件从句过去完成时+主句would/might/should(should 仅用于第一人称)have+ 过去分词 If she had worked harder, she would have succeeded. 2.在宾语从句中的应用 在表示命令、建议、要求等一类动词后面的从句中： order, suggest, propose, require, demand, request, insist, command, insist + that sb (should) do 注意，suggest作”表明，暗示”的意思理解时，不需要用虚拟语气 Her tears on her face suggests that she has been crying just. 她脸上的泪痕表明她刚刚哭过. 1) I suggest that we (should) put off the meeting till next week. 2) He insisted that they (should ) be informed of our descision 3.. 用于wish后面的从句，表示与事实相反的情况，或表示将来不太可能实现的愿望。 1)I wish I knew the answer. 2) Iwish I had known you earlier. 4. if only if only则表示如果……就好了，除非，If only也可用于陈述语气。
If only Dad were here,he would be quite.除非爸爸在这，他才会安分点.（爸爸现在不在这，与事实不符，期待不会实现） If only he comes early（期待可实现，故无需虚拟语态）.但愿他早点回来。 5. would rather +从句（从句中的谓语动词用一般过去时表示将来） 1) I’d rather you left me alone. 2) I’d rather you didn’t tell he now. 6. should have/could have+完成时表示“本应该、本可以” 1) None of us stopped to think and we should have. 2) We could have been good friends. 虚拟语气总结 21 虚拟语气在条件句中的用法：普通条件句：would/could/should/might do将来 1.did 2.should 3.were/was to（将来万一发生的情况）过去 would/might/could/ should have done had done现在 would/could/should/might do did/were/was 特殊的虚拟条件句：1.省去条件从句（含蓄条件句） eg. I couldn’t do it. (if I were you).2.隐含的假设条件句：可用来表示隐含条件的有（1）连词or,otherwise,but,however等 eg.He was very busy, otherwise he would have come to the meeting.(2)介词without,with,but for等引导的介词短语 Without your help, our team wouldn’t have won the last match.(3)不定式短语，名词短语或陈述句等 eg. He would make a mistake not to help him. （不定式短语）If we didn’t help him, he would make a mistake.3.省去主句： eg.If he were here ! If you could have heard the wonderful lecture!4.错综时间条件句：如果条件从句和主句动作发生的时间一致，这时动词的形式应根据它所要表达的具体时间来决定.eg. If the weather had been （与过去相反）finer, the crops would be growing （与现在正在进行的事相反） still better.5.从句中谓动可用 should do，主句可用虚拟语气，也可用直陈语气.eg. If I should be free tomorrow, I will /would come.6.有时从句中有助动词，情态动词should，动词be 或have，可省去if，从句用倒装语序.eg. If I were you, I would give it up. Were I you, I would give it up.2 虚拟语气用于宾语从句中：1.用在表示suggest,order,command,request,advise建议，命令，要求，忠告等动词后，动词形式为（should） do.在insist后的从句中A.如果坚持做什么事情，用虚拟语气B.如果坚持某种意见，用陈述语气在suggest后的从句中A.如果表示建议，用虚拟语气B.如果表示表明，暗示，用陈述语气2.在动词wish后的宾语从句（1）与现在事实相反，从句的谓动词用过去式（did）(2)和过去事实相反：用wish表示对过去事情的遗憾.其句子结构为：had done或would, could, might have done.(3)表示将来的主观愿望：从句动词would/could/might + 动词原形注意： 1.如果将wish改为过去式wished， 其后that从句中的动词形式不变.eg. I wished I hadn’t spent so much money.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.eg. I wish he would answer my letter.If only引起的惊叹句中，和wish后宾语从句中谓语一样.3.用在would rather/sooner,had rather, would (just),as soon，引导的宾语从句中，表示”宁愿做什么”或对过去做的事的懊悔.（1）表示与现在或将来事实相反用did eg. I would rather you paid me now.(2)表示与过去事实相反用had done eg. I would rather you had gone, too.注意（1）若某人愿自己做某事，would rather后用动词原形eg. I would rather stay at home today.(2)would rather。
than。中用动词原形 eg. I would rather stay at home than go out today.3 虚拟语气用于定语从句中It’s (about/high) time +that sb. did/ should do (should 不能省) eg.It’s high time that you went. It’s about time that 。
8.英语虚拟语气的知识点
一、与现在事实相反
若与现在事实相反，虚拟语气的条件从句的谓语用过去式（be通常用were），主句谓语用“should (would, could, might)+动词原形”。如：
If you took a taxi,you’d get there quicker. 如果你坐出租车去，你可以快一点到那里。（但你不坐）
If I knew her number I could ring her up. 要是我知道她的电话号码，我就可以给她打电话了。（可惜我不知道）
二、与过去事实相反
若与过去事实相反，虚拟语气的条件从句的谓语用过去完成时（had+过去分词），主句谓语用“should (would, could, might)+have+过去分词”。如：
If I’d left sooner,I’d have been on time. 要是我早点动身，我就准时到了。（但我动身太迟了）
If we had found him earlier we could have saved his life. 要是我们当时早点找到他的话，我们就可以救活他。（可惜我们找到他太晚了）
三、与将来事实相反
若与将来事实相反，条件从句的谓语用过去式（be通常用were），主句谓语用“should (would, could, might)+动词原形”。如：
If he went,would you go too？ 如果他去，你也去吗？（大概他不会去）
If I asked him,I’m sure he’d help us. 如果我向他提出要求，肯定他会帮助我们。（不过我不打算这样做）
注意与说明：对于与将来事实相反的情形，请注意以下几点：
一是这里说的与将来事实相反，实为对将来情况的推测；
二是此用法中的条件从句谓语除用过去式外，有时也用“should+动词原形”（表示可能性极小，常译为“万一”）或“were to+动词原形”（表示与将来事实相反的假设）；
三是当条件从句使用“should+动词原形”这样的谓语时，主句谓语除可用“should (would, could, might)+动词原形”这样的虚拟语气外，也可用陈述语气或祈使语气。如：
I should see him, I’ll tell him. 万一我见到他，我就告诉他。
If it should rain tomorrow, don’t expect me. 万一明天下雨，就别等我了
9.虚拟语气的相关知识点（详细,要有例句）
虚拟语气（Subjunctive Mood）这一语法项目是各类英语考试中心测试的重点之一。
虚拟语气是一种特殊的动词形式，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。 Ⅰ用以表示虚拟条件的虚拟语气 ⒈ 用if条件从句表示的虚拟条件，是虚拟条件最普通的方式。
① 虚拟现在时表示与现在事实相反的假设，其if 从句的谓语形式用动词的过去式（be 一般用were），主句用would/ should/ could/ might +动词原形，例如：If I were in your position I would marry her. ② 虚拟过去时是表示与过去事实相反的假设，if 从句的谓语形式用过去完成时即had+过去分词，主句用would / should / could / might + have +过去分词，例如：If it had not rained so hard yesterday we could have played tennis. ③ 大多数的虚拟条件句属于上面三种情况的一种，但并不排除存在条件和后果中，一个和现在情况相反，另一个和过去情况相反，例如：If you had followed what the doctor said, you would not have been so painful now.这个句子在高中出现频率颇高。 ④ 但是，如果后果用了虚拟语气，而条件却用陈述语气，这种用法是错的。
⒉ 除了表示虚假条件外，if从句还可以表示对将来的推测，由于是将来还没有发生的，所以谈不上是真实的还是虚假的，只能说这个事情发生的可能性有多大。一般情况下，可以用陈述语气的if从句来表示对一个未来事实的推测，这个事实是完全可能发生的。
If从句的谓语形式用一般过去式或用were to / should +动词原形，主句用would / should /could/ might +动词原形，例如：Jean doesn’t want to work right away because she thinks that if she were to get a job she probably wouldn’t be able to see her friends very often.(1996年1月四级第44题) ⒊ 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，这时候，如果出现not等否定词，否定词需放在主语后面。这种结构在口语中很少使用，但频频出现在各类考试中出现，例如：If it had not rained so hard yesterday we could have played tennis.→Had it not rained so hard yesterday, we could have played tennis. ⒋ 大多数的虚拟条件通过上面所讲的两种方法表达，但在个别句子中也可以通过介词without和介词短语but for表达，副词otherwise等表达出来。
例如：We didn’t know his telephone number; otherwise we would have telephoned him.(1995年6月四级第46题)值得注意的是，包含but for的句子，谓语动词必定要用虚拟形式，但包含without等短语的句子，谓语动词未必一定要用虚拟语气。 ⒌ 有时虚拟条件不是明确地表达出来，而在蕴含在用but引导的从句里，于是便出现了有谓语动词是虚拟语气的主句加上谓语动词是陈述语气的but从句构成的并列复合句，例如I would have hung you but the telephone was out of order.在这样的句子里，如果主句没有用虚拟语气，或者从句用了虚拟语气，都是错的。
Ⅱ用在宾语从句中的虚拟语气 ⒈ 在表示愿望的动词wish后的宾语从句中，需用虚拟语气。（wish后的that 常省略），根据主句时态，从句谓语时态相应退后一位，例如：How she wished his family could go with him. ⒉ 在具有愿望、请求、建议、命令等主观意愿的动词（desire, demand, advice, insist, require, suggest, propose, order, recommend, decide …） 后的宾语从句中需用虚拟语气。
谓语动词用（should） +动词原形。值得注意的是，如果宾语从句的动词是否定的，否定词not的位置应在动词之前，而不是动词之后。
例如：The head nurse insisted that the patient not be move.另外，如suggest表达“暗示”，insist表示“坚持某种说法”时，后面的从句不用虚拟语气，例如：Her pale face suggests that she is ill.或He insisted that he did not kill the boy. 除此之外，上述动词也要求用虚拟式 ① 在It is+上述动词的过去分词，其后所跟的主语从句中，如It is suggested that pupils wear school uniforms. ② 在上述动词相应的名词形式作主语+连系动词，其后的表语从句中，例如His suggestion was that classed be re-scheduled. ③ 在对上述动词相应的名词进行解释的同位语从句中，如：The workers raised the demand that their pay be increased to cope with the inflation. ⒊ would (had)rather , would sooner也用来表达主观愿望，它们之后的宾语从句中需用虚拟语气。谓语动词用过去式表示现在或将来，用过去完成式表示与过去事实相反，例如：I would rather he went right now. Ⅲ其他形式的虚拟语气 ⒈ it is +necessary等形容词后，that主语从句中虚拟形式使用，这类形容词包括necessary, important, essential, imperative, urgent, preferable, vital, advisable等，例如It is necessary that you listen to the teacher carefully.或者It is essential that you be able to pronounce every single word correctly. ⒉ 在It’s (high/about) time 之后的定语从句中需用虚拟语气。
谓语动词用过去式，例如It is high time that you went to school ⒊ 虚拟语气在as if / as though 引导的方式状语从句中的应用（谓语动词形式。
