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虚拟语气难点分类总结
首先要确认是非真实的主观愿望后遐想，才是虚拟语气
一、什么情况从句必须用 sb.Should do 的形式
1）should不可以省略的情况：for fear that ,in case that ,lest引导的目的状语。
Eg:
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）should可以省略的情况。有两种
第一种：表情绪.观点的形容词或名词也要用虚拟语气.如:neceary.important.impoible.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.Eg：
第二种：
1、一想要(desire)
二宁愿(prefer)
三命令(order.command)
四建议(advice.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。
二、在虚拟语气中，不管什么人称，be动词都要用were的形式。If I were you, I would pay more attention to English idioms and phrases.三、虚拟语气用在wish 后的宾语从句，一定都是过去式形态。(if only和as if/as though引导的让步状语从句，结构与之相同）a、与现在事实相反，谓语动词用一般过去时
eg.I wish I had your brains.(事实：我根本比不上你)
b、与过去事实相反，谓语动词过去完成时
eg:.I wish I had known the truth of the matter.（事实：原来不知道）
c、表示将来难以实现的愿望，谓语动词过去将来时 谓语动词：should/would + 动词原形
eg.I wish I should have a chance again.（事实：很难再有这样的机会了）。
四、从句只接的过去时、过去完成时的情况。
①、would rather 从句谓语动词：过去时（对应现在、将来）、过去完成时（对应过去）
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
②、It is time that 从句：过去时。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。
补充：而It is hignt time that从句：表示：“早该做某事了”，其虚拟语气的结构为：It is high time that + 主语+ should + 动词原形，It is high time you should go to work.你早该上班了。
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 progre.要是没有你的指导，我不会取得如此大的进步。
五、在whatever，whichever，whenever，whoever, wherever，however, no matter wh-word 等引导的让步状语从句中，从句虚拟语气结构比较特殊。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 progre 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。
六、两种特殊条件句需注意。
①、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
would +动词原形(指现在或将来)、现在完成式(指过去)。Eg： 1）But for his help, we would be working now.要不是他的帮助，我们还会在工作呢。
2)Without your instruction, I would not have made such great progre.要是没有你的指导，我不会取得如此大的进步。
②、错综条件句。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。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。
本文参考：虚拟语气讲解及练习题。
