Unit4 Revision英语中的语气分为三类：1. 陈述语气（用于陈述句、疑问句、感叹句）2. 祈使语气（用于祈使句） 3. 虚拟语气（用于条件状语从句、宾语从句等）二、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。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e.g. 如果他不快点，他就错过汽车了。If he doesn’t hurry up, he will miss the bus.( 真实条件状语 )2. 如果我是你，我就立即走。3. 如果没有空气， 人们将会死。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）从句谓语动词过去式形式（ be 用 were ）主句谓语动词形式 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 his I telephone knew number, I tell would you. 如果我知道他的电话号码，我就会告诉你。（事实：不知道）1.If I knew his telephone number, I would tell you. 2.If were no there air water or, there be no would living on things 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 ) 2.If there were no air or water, there would be no living things on the earth. 3.If had I money any with me, I could you lend some.如果我带钱了，我就会借给你些。（事实：没带钱） 3. If I had any money with me, I could lend you some. ② 表示与过去事实相反的情况从句谓语动词形式 Had+ 过去分词主句谓语动词形式 Should/would/could/might+have+ 过去分词e.g. 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从句 If+ 主语 ① were did② were to do ③主句...
