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1、情态动词+完成时情态动词+完成时的特殊含义 情态动词和动词原型连用，多表示对目前或将来情况的看法或态度，但情态动词和完成时连用时，多用来表示对过去情况的看法或态度。 1. should+have+过去分词 表示过去“本应该”。而实际上该动作并未做，暗示说话人对自己的责备，抱怨或遗憾的意思。 We should have cut away the jungle brush. 我们本应该把丛林的灌木砍掉。 How I regretted the days when I had played and should have studied. 我多么懊悔我把本应该好好学习的日子都玩掉了。 Should
2、nt+have+过去分词表示过去“本不应该”而实际上做了的动作。 You shouldnt have told anyone about it. 你本来不应该告诉任何人。 They shouldnt have left so soon. 他们本来不应该去得那么早。 2. ought to + have + 过去分词表示过去“本应该。”而实际上未做。相当于“should + have + 过去分词” You ought to have helped him. 你应该帮他一把。 You ought to have returned these books to the school library
3、 last week. 上周你就应该把这些书还给学校图书室。 否定形式oughtnt to + have + 过去分词 = shouldnt + have +过去分词 eg. You oughtnt to have taken his umbrella away. 你不该把他的伞拿走。 He oughtnt to have been there. 他本不应该到那去。 3. must + have + 过去分词表示对过去情况的推测，译成“一定， 相必，可能”。 What a challenge I must have been to this young teacher. 对这位年轻教师来说，教
4、我这样的学生一定是个巨大的挑战。 Since the ditch is full of water, it must have rained last night. 因为沟里涨满了水，昨晚一定下雨了。 表示对过去情况的否定推测时。要用“cant (couldnt) + have + 过去分词”，一般不用“mustnt + have + 过去分词”。 Joe cant have left. I saw him just now. 乔不可能离开，刚才我还看见他了。 The party couldnt have been successful as you had hoped. 舞会不可能象你希望的
5、那样成功。 “must + have + 过去分词”表示对过去情况推测时，反意疑问句用have (has), 有明确表示过去时间的状语 反意疑问句用did. He must have finished his homework, hasnt he? 他准把作业做完了。对吗？ He must have attended the meeting yesterday evening, didnt he? 他昨晚上肯定参加会议了，是吗？ 4. may (might) + have + 过去分词表示对过去情况的推测。用might + have + 过去分词可以用于肯定句，否定句，但不用于疑问句 In r
6、eturn I may have been able to teach you a little about medical technique. 作为报答，我也许教给了你们一点点医疗技术。 Might he have been caught and killed? 他有可能被抓住杀掉吗？ Might + have + 过去分词也能表示对过去的事情的可能性的推测，有“本应该。”，但未实现的动作，含有婉转责备的意思。 You might have listened to me while I was talking to you. 我对你讲话时，你应该认真听才对。 You might have
7、let me know before you went out. 外出之前，你应该先告诉我。 5. can (could) + have +过去分词表示对过去情况的推测。“can + have + 过去分词”一般多用于疑问句和否定句， 不用于肯定句。 Can he have gone yesterday? 难道他昨天就已经走了吗？ They cant have lost themselves in the woods, because I drew a map to them. 他们不可能在森林中迷路，因为我给他们画了一张画。 Bill couldnt have gone home this
8、weekend. I saw him at the school ground this morning. 本周末贝尔不可能回家，今天下午我还在学校操场上看见他了。 “Can (could) + have + 过去分词” 也表示过去“本应该。”而未做。 John could have read his assignment while he waited for the doctor. 约翰在等医生的时候应该看一下他的作业。 Mary cant have gone to school. Its Sunday. 玛丽不可能去上学，今天是星期天。 在表示对过去某事的推测时，可用could/ mig
9、ht / may + 完成时。 They could/might/may have heard the news from smith. 他们也许从史蜜斯那儿听到了这个消息。 6. need + have +过去分词表示过去“没有必要做”，有责备的意思。否定形式表示“做了本不应该。”的 事 Need you have watched TV last night? 你昨晚有必要看电视吗？ You neednt have woken me up so early. Its Sunday today. 你没有必要这么早就叫醒我，今天是星期天。 7. would + have + 过去分词表示“本应该。”，而未。 We would have argued with you. 我们当时应该与你们争辩一下。 另外：would like to have + 过去分词表示过去希望做。，但未。 I would like to have seen the film. 我希望我当时看了这部电影。 I would like to have met her.
