高二英语 Module21 Lesson 1 虚拟语气用法复习学案 北师大版模块七VIP专享

Unit 21 Human Biology Lesson 1 Super AthletesGrammar---- “虚拟语气”Tips：When you＇re good to others, you are best to yourself. 善待他人，即是最善待自己。 Learning objective: How to use “虚拟语气Key &Difficult Learning Point: How to use “虚拟语气”correctlyLearning ProceduresStep 1 虚拟语气的基本用法虚拟语气是谓语动词的一种形式，用来表示非真实的假设，或者用来表示命令、建议或说话人的主观愿望。 一、非真实条件中的虚拟语气 非真实条件就是违背事实情况的假设，包括违背现在事实的假设，违背过去事实的假设，以及违背将来的假设。在这三种情况下，条件从句和主句中的谓语动词采取下列虚拟形式。 1．违背现在事实的假设：从句谓语动词用一般过去时（were/did），主句谓语动词用 would/could /should /might+动词原形If the earth had no gravity，the moon would fly to the sun．假如地球没有引力，月球就要向太阳飞去。If were a fish, I could swim in the river freely.假如我是鱼的话，我就可以在河中自由地游泳了。If I were you ，I would reconsider their proposal．我要是你，就重新考虑他们的建议。 2．违背过去事实的假设 ：从句谓语动词用 过去完成时（ had+ been/done），主句谓语动词用 would/could /should /might + have+动词过去分词If I had left a little earlier, I would have caught the train．我要是早点动身，就赶上火车了。If I had studied harder, I would have been admitted to a better university. 我要是早点更加努力学习的话，就被一所好大学录取了。If she hadn't taken your advice, she would have made a serious mistake．她要不是听了你的劝告，就犯大错误了。 3．可能违背将来事实的假设：从句谓语动词用过去式/Were to/should+动词原形，：主句谓语动词用would /could /should/might+动词原形这里指的是将来不大可能发生的假设，或者虽有可能发生，但说话人主观上不希望发生的假设。这种假设相当于汉语中常用的"万一"，"居然"，"竟然"等含义。例如： If he should fail, we would encourage him to try again．万一他失败，我们就鼓励他再试一次。 If I were to be given another chance, I would study...