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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)
一、虚拟语气
如果所说的不是事实，而是一种假设、愿望、建议或是一种实现不了的空想，就用虚拟语气。
二、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
If he doesn't hurry up, he will miss the bus.( 真实条件状语)
If he was free, he asked 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.
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发表于 2016-7-2 18:07:57
