情态动词表示推测：
情态动词表示推测的有：must一定、could很有可能、may可能、might有一些可能。它们的用法是：
1. 它们表示推测只能用于肯定句之中，而疑问句用can，否定句用can’t不可能。
Can the he stay at home at the moment? 现在他能在家么？
He must be staying at home. 他一定在家。
He can’t be staying at home. 他不可能在家。
2. 情态动词用原形，表示对现在或将来的情况时行推测。
He must be a teacher. 他可能是一名老师。（系表）
We may travel by sea next month. 下个月，我们可能乘船旅行。
3. 情态动词用be doing，表示对现在的情况进行推测。
He must be having a lot of money. 他一定有很多钱。
Jim may be playing the basketball. 吉姆可能正在打篮球。
4. 情态动词用have done，表示对过去的情况进行推测。
It must have rained yesterday. 昨天一定下雨了。
I can’t have been late yesterday. 我昨天不可能迟到。
She could have phoned you last night. 她昨晚应该给你打电话了。
He must have stayed at home when we arrived. 当我们到达的时候，他一定在家。
5. 情态动词用have been doing，表示对过去正在进行的动作或过去一直进行的动作进行推测。
She may have been doing his homework last night. 昨天晚上，他可能一直在写作业。
下列表示建议的情态动词：
几组表推测的情态动词用法
1..must have done 表示对已经发生的事情的推测 意为“一定 想必”,
2. can/ could have done表示对过去的时间内可能发生的事情的猜测
3. may /might have done 1 表示对已经发生的事情的不太肯定的推测 意为“可能已经或许已经”。 2 虚拟用法表示本可以做 但却没做 表示很委屈地责备
4. should /ought to have done 指本该做而实际未做的事 意为“本来应该”。其否定式shouldn’t oughtn’t have done 则表示某种行为不该发生但却发生了
5.Would have done 本想做 却没做 wouldn’t have done 本不想做 却做了
一、 单项选择
1 John___ come to see us tonight, but he isn't very sure yet.
A. may B. need C. can’t D. must
2 John isn’t in the classroom. He ______ play soccer on the playground with Bob.
A. can B. must C. should D. can’t
3 -Will you go to the cinema with us? -No, I _____ rather read a magazine at home.
A. should B. might C. would D. had better
4 You___ go and see a doctor at once because you got a fever.
A. can B. must C. dare D. would
5 -Can you speak Japanese? -No, I____.
A. mustn't B. can't C. needn't D. may not
6 -He___ be in the classroom, I think. -No, he ___ be in the classroom. I saw him go home a minute ago. A. can; may not B. must; may not C. may; can't D. may; mustn't
7 -Is Lena swimming in the pool? -No, she _____ swim. She is terrified of water.
A. may not B. must not C. can't D. needn't
8 He isn't at school. I think he ___ be ill.
A. can B. shall C. must D. might
二情态动词+have done 结构
1．---You didn’t wait for Mr. Smith last night, did you? ---No, but we ______. He didn’t return home at all. A. couldn’t have waited B. needn’t have C. didn’t need to D. should wait
2．Harry ______ have won the Physics competition easily yesterday, but he gave up.
A. could B. might C. should D. must
3．---May I speak to your manager Mr. Smith at six o’clock tonight ?”
---“I’m sorry, Mr. Smith ______ to a conference before then.”
A. will have gone B. had gone C. would have gone D. has gone
4．---Tom took away our teacher’s cell phone without being permitted.
--- Really? I can’t imagine that he _______ have done such a thing.
A. must B. may C. can D. should
6．The weather turned out to be fine yesterday. I_________ the trouble to carry my umbrella with me .
A. should have taken B. could have taken C. needn't have taken D. mustn't have taken
7．He paid for a seat, when he ______ have entered free.
A. could B. would C. must D. need
8．I didn’t see her in the meeting room this morning. She_______ at the meeting .
A. mustn’t have spoken B. mightn’t have spoken C. can’t have spoken D. shouldn’t have spoken
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