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情态动词表推测和虚拟的区分


1,情态动词表推测 must 表示推测时,可以推测现在/正在发生的动作/过去发生的动作。 He must have a car now. (现在)他一定有辆小汽车。 He must be doing his exercises in the classroom.(正在进行)他一定在 教室里做练习。 He must have finished the work.(过去发生)他一定已完成了工作。 2,can’t/couldn’t+ have done,表示对过去发生的动作进行推测。 He can't have gone to Shanghai for I saw him a minute ago. 他不可能去了上海,我刚才还看见他。 3, may 和 might 的用法 (1) may, might 表示推测“可能性”时,意思是“可能” 、 “也许” (3)may, might 可以推测现在正在发生的动作或过去发生的动作。 He may / might be sleeping now. The boy may / might not be watching TV at home. 这个男孩可能没在家看电视 These students may / might have seen the film before. (过去)这些学生以前可能看过这部电影。 He may / might be American. = It is possible that he is American. 他可能是个美国人。 例题 1–That man must be Sarah’s husband. --No, he_____ be her husband. She is still single.

A. can't

B. mustn't

C. may not

D. ought to

2 Peter _____come with us tonight, but he isn't very sure. A. must B. may C. can D. will

3–I saw Mary in the library yesterday. --You_____ her. She is still abroad. A. mustn't see B. can't have seen C. mustn't have seen D. couldn't see 2,情态动词表虚拟 should have done 过去本来应该(而实际上并没有?) should not have done 过去本不应该做?而实际上却已经?” 如:1、We should have studied last night, but we went to the concert instead . 我们昨晚本应学习的,但我们却去看音乐会了。 (实际上没 有学习) could have done 它表示“过去本来能够?” 实际上没能做?。 could not have done 它表示“过去本来不能够?” 了?。 如 1、I could have run 100 meters in 12 seconds. 我本来能用 12 秒钟完 100 米的.(实际上没能) 2、If you had finished the task in time,you could have been promoted. 如果你当时能如期完成那任务的话,你可能已提升了(实际上没有被 提升) would have done 用在虚拟语气中,表示与过去事实相反之假设的结 实际上却做成

果,常与 if 引导的条件句连用。

(1)I would have helped you if I had known of your difficulties . 要是 我当时知道你们的窘境,我就会帮助你了(而实际上没有帮助你) (2) If it hadn't rained yesterday, we would have gone out for a walk . 假 如昨天没下雨,我们就去散步了。 (实际上没有去) might have done 过去本来可以(而实际上并没有?) might not have done 过去本不可以做?而实际上却已经?” I might have passed the exam, but I failed. 1.Mr White ____ at 8:30 for the meeting, but he didn't turn up. A. should have arrived B. should arrive

C. should have had arrived D. should be arriving 2. If he had been here yesterday, he ______ this pop star. A. would meet C. met B. would have met D. must have met


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