虚拟语气用来表示假想，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。下面小编告诉你英语虚拟语气动词用法，大家一起来看看吧!
英语虚拟语气动词用法：
(1) 在主语从句中用来表示惊奇、惋惜、理应如此等，其谓语形式是"should(可省) +动词原形"，常用于以下三种句型中。
句型一：It is necessary (important, natural, strange, etc) that…
句型二：It is a pity (a shame, no wonder, etc) that…
句型三：It is suggested (requested, proposed, desired, etc) that…
如： It is strange that he (should) have done that.
It is a pity that he (should) be so careless.
It is requested that we (should) be so careless.
(2) 在宾语从句中用于suggest, propose, move, insist, desire, demand, request, order, command等动词后的宾语从句中，表间接的命令和建议。其谓语形式是"(should)+动词原形"。如：
I suggest that we (should) go swimming.
(3) 在表语从句中，表示间接的命令，要求、请求、建议、决定等，主句中的主语通常是suggestion, proposal, request, orders, idea等。从句谓语形式是"(should)+动词原形"。如：
His suggestion is that we (should) leave at once.
(4) 在同位语从句中，谓语形式是"(should)+动词原形"。如：
We received order that the work be done at once.
(5) 在It is time that…句型中，其谓语动词形式是"动词的过去式"或
"should +动词原形",should不可省。如：
It's time (that) we went ( should go) to school.
某些从句中的虚拟语气用法：
1. would rather后的句子用虚拟语气
通常用一般过去时表示现在或将来的愿望，用过去完成时表过去的愿望。如：
I’d rather you came next Saturday. 我宁愿你下星期六来。
I’d rather you hadn’t done that. 我宁愿你没这样做。
2. 某些用虚拟语气的主语从句
形容词important, impossible, necessary等后的主语从句通常用虚拟语气。如：
It is impossible that he should go home. 他不可能会回家去。
It is necessary that I should return it right now. 我有必要马上还回去。
注：在It is amazing (strange, surprising, astonishing, a pity, a shame)以及 I am surprised (sorry) 和I regret等结构后的that 从句中有时也用should，表示说话人的惊异、懊悔、失望等情感，常含有“竟然”之意。如：
It’s strange that he should be so rude. 他竟如此无礼，真是奇怪。
I’m surprised that he should have failed. 他竟然失败了，这使我很吃惊。
若不用虚拟语气也可以，则不带感色彩，比较：
It’s a pity that he failed the exam. 他考试没及格，真是遗憾。
It’s a pity that he should have failed the exam. 他考试竟没及格，真是遗憾。
备考虚拟语气的两个易错点：
1. 误解错综时间虚拟语气的时间关系
错综时间虚拟语气的从句与主句所指时间不一致，做题时应根据具体的语境作出正确的理解。如：
It is hard for me to imagine what I would be doing today if I _______ in love, at the age of seven, with the Melinda Cox Library in my hometown.
A. wouldn’t have fallen
B. had not fallen
C. should fall
D. were to fall
答案为 B。此题涉及错综时间虚拟条件句，主句与现在事实相反，条件句与过去事实相反。句意为：要不是在七岁时就迷上了 Melinda Cox 图书馆，我真不能想象我如今会在做什么。
2. 忽略insist, suggest的两种用法
有的同学以为insist和suggest后面的宾语从句一定要要用虚拟语气。其实不一定，应根据具体语境来确定使用什么语气。如：
He insisted that he was not ill, but the doctor insisted that he should take the medicine.
A. was not, took
B. should be, should take
C. was not, should take
D. should be, toke
答案为C。第一空用陈述语气，强调宾语从句的内容为事实;第二空用虚拟语气，说明宾语从句的内容还不是事实。句意为：他坚持说他没有病，但医生却坚持要他服药。
虚拟语气的两个常见命题角度：
1. 直接考查虚拟语气的用法
—Don’t you think it necessary that he _______ to Miami but to New York?
— I agree, but the problem is _______ he has refused to.
A. will not be sent; that
B. not be sent; that
C. should not be sent; what
D. should not send; what
答案为B。因为necessary后的从句要用“(should+)动词原形”，排除选项A;因he与send是被动关系，send要用被动式，排除选项D;答句中的表语从句中不缺任何句子成分，用that。值得说明的是，refuse to后省略了be sent to New York。
2. 利用虚拟语气背景进行命题
(1)_______ he had not hurt his leg, John would have won the race.
A. If B. Since
C. Though D. When
答案为A。全句使用的是虚拟语气背景，if在此引出一个虚拟条件。
(2) If Newton lived today, he would be surprised by what ______ in science and technology.
A. had discovered
B. had been discovered
C. has discovered
D. has been discovered
答案为D。此题可用排除法来做。根据what与discover的关系可知，此处应用被动语态，即指被发现的东西，故可排除选项A和C;由于句子使用了虚拟语气， 所以此题的迷惑性很大，许多考生会误选B。其实，由于句中的虚拟语气是对现的情况进行假设(注意句中的today)，而且“在科学和技术方面所取得的发现”指的是现在的事实，而非假设，所以此处要用现在完成时，而不能用过去完成时。
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