完成式.pptVIP

完成式 * * 虚拟语气 与过去事实相反 If 条件句 主句 had done would should could might have done 含蓄条件句 1 用without 或 but for引出 Without your help, I would have failed. But for the storm, we should have arrived. 2 省去 if,把 were 或 had 或 should提前到句首的倒装 Were I a student again, I would study harder. Should he come tomorrow, I would tell him about it. 3 利用上下文或其它方式 （整个从句不写出） I was busy ; otherwise , I would have joined you. If only he had not left ! That would be fine. ( if you should do it. ) 情态动词与完成式 can’t / couldn’t have done 不可能做过 must have done 肯定已做过 may / might have done 或许做过 might have done 本来可能，但实际上没有做 should / ought to have done 本来应该做却没做 could have done 可能做过；本来可以做却没做 needn’t have done 本来没必要做却已做 shouldn’t / oughtn’t have done 本来不应该做却已做 would rather have done当时宁愿做了某事（表后悔） My sister met him at the Grand Theater yesterday afternoon, so he ______ your lecture. couldn’t have attended B. needn’t have attended C.mustn’t have attended D.shouldn’t have attended 2.Look at Judy’s red eyes. She _______. A. would be crying B. might cry C. must cry D. must have cried 3.Thank you for your birthday gift. In fact, you ____ so much money on it. A.must spend B. need to spend C.could spend D. needn’t have spent 4.---Did you stay at home last night ? ---Yes, but I _______ dancing. A.would rather gone B.would go C.would rather have gone D.would gone The perfect infinitive --- to have done --- the action of the perfect infinitive is an earlier action. It happens before the time of the main verb. I am sorry to have kept you waiting. I am glad to have paid a visit to him last week. 不定式的完成式与 happen, appear, seem, pretend 1.He seems to have been a teacher. ---It seems that he was a teacher. Cf. He seems to be a