虚拟语气是英语语法中一个重要的组成部分，虚拟语气表示说话人的主观愿望、猜疑、建议或与事实不符的假设等，不表示客观存在的事实。虽然初中阶段虚拟语气不是重点，但是还是建议收藏，为以后打下基础哦!下面小编给大家分享一些英语虚拟语气知识，希望能够帮助大家，欢迎阅读!
英语虚拟语气知识1
表示与现在事实相反的情况
从句：If+主语+动词一般过去时(be动词用were)
主句：主语+ should/would/might/could+动词原形
If I were you, I would take an umbrella.
如果我是你，我就会带把伞。(事实：我不是你)
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)
英语虚拟语气知识2
表示与过去事实相反的情况
从句：If+主语+had+done
主句：主语+should/would/might/could+have done
If I had got there earlier，I should/would have met her.
如果我到那，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)
英语虚拟语气知识3
表示与将来事实相反
从句：①if+主语+were to do
②if+主语+should+do
③if+主语+动词一般过去式(be动词用were)
主句：
主语+should/would/might/could+do
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，不可能)
If there were a heavy snow next Sunday，we would go skating.
如果下周日下大雪，我们就去滑冰。(事实：下雪可能性很小，不可能)
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。(事实：来的可能性很小，不可能)
除了以上三种主要情况，虚拟语气还有以下几种结构和用法：
当从句的谓语动词含有were/should/had时，if可以省略，这时从句要用倒装语序，即把were/should/had等词置于句首，这种多用于书面语。
Should he speak fluent English, we would send him there.
要是能说流利的英语的话，我们就派他去了。
Were she here, she would agree with us.(If she were here...)
如果她在这儿的话，她会同意我们的。
有些条件句只暗含在副词、介词短语、上下文或其他方式表示出来，这种情况也要用虚拟语气。
在多数情况下，条件会暗含在短语中，如without…/but for…(要不是因为...)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。
We would have come home safely it were not for your kindness.
如果不是你的慷慨心善，我们是不可能安全回家的。
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。
有时，虚拟语气的结构中，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。
省略从句
He would have finished it(if...).
他本该完成了。
You could have passed this exam(if...).
你本来能通过这次考试的。
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 won the game
我要是赢了比赛多好啊!
注意，在虚拟语气的从句中，动词be的过去时态一律用were，不用was。
If I were you, I would go to look for him.
如果我是你，就会去找他。
If I were a bird, I would fly day and night.
如果我是一只鸟，我会没日没夜的飞翔。
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