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...