大学英语B辅导06(虚拟语气之二)课件.pptVIP

虚拟语气（之二）;二.虚拟语气在条件句中的形式和应用;在if/unless引导的真实条件句中： if/unless从句用一般现在时,主句用一般将来时。 if/unless从句用一般现在时,主句用情态动词+V. *在When引导的时间状语从句中: when从句用一般现在时,主句用一般将来时(如果主句用情态动词+V.) 。 We’ll stay at home when it rains. ;2.虚拟条件句unreal conditional：假设的条件不可能发生 If he had time, he would come. 他要是有时间的话就会来了。（但事实上他没有时间） If you didn’t go so fast, you couldn’t get dizzy. 你要是走慢点就不会头晕。（但事实上你走得快）;虚拟条件句的形式;虚拟条件句的形式;*注意：;2.如果从句中含有were, had, should, could，可以将if去掉，但使用倒装形式. Were he to tell us everything (=if he were to tell us everything), we could try to solve his problem. 如果他把事情全告诉我们，我们就能设法解决他的问题了。 Had you not helped us(=if you hadn’t helped us), we couldn’t have finished the work. 如果没有你的帮助，我们就不能完成工作。;将括号内的词改写成与现在或将来事实相反的虚拟条件;将括号内的词改写成与过去事实相反的虚拟条件;虚拟语气的其它形式; I lost my passport. 我丢了护照。 I could have left it in the shop. 我可能丢在商店了。 I must have left it in the café. 我一定丢在咖啡店了。 I should have put it in my bag. 我本应把它放包里。 I ought to have put it in my bag. 我本应把它放包里。 I shouldn’t have put it in the taxi. 我本不把它放在出租车里。; If the teacher ____ in time yesterday, a fighting would have taken place. Was not come Were not come Would not come Had not come; If he ____ such a good chance, he would have planned to learn more. Was giving Had given Had been given Was to give ; ____ yesterday, I would have asked him not to do that. If he had come If he came Provided (=if) he came Has he came; If the weather had been good, the children ____ out for a walk. Had gone Would go Could have gone Went ; ____ the advice of his friends, he would not have suffered such a heavy loss in his business. If he took If he should take Were he to take Had he taken ; I ____ my composition by now if I had stopped talking with him. Would finish Would have finished Finished Finish ;My wallet is nowhere to be found. I ___ in the store. A. Must drop it B. Must have dropped it C. Should have dropped it D. Ought to have dropped it ; If they ____ searching, I would have died. Gave up Have given up Had given up G