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在或将来的情况作出语气强弱不同的推测。 1. 把握推测语气的特点，选择恰当的情态动词。
表示肯定的推测时，语气从弱到强依次为might → may → could → can →
must；表示否定的推测时，can’t和couldn’t语气较强，意为“不可能”，may not和might not语气较弱，意为“可能不”。
情态动词表示推测时，must只用于肯定句中，表示很有把握的推测，意为“一定；准是”；can多用于否定句或疑问句中。如： They have been working hard all day. They must be tired. Sam can’t be at home now, for I saw him going shopping just now. At that time we thought the story could not be true. What can Neal possibly mean?
Why not ask Paul for help? He may know the answer. They all said that Adam might come home before Christmas. Don’t be so sure. He might not help us this time. 2. 确定被推测时间，选择正确的谓语结构。
对现在或将来的事情进行推测时，用“情态动词+动词原形”。如： Mr. Reed looks pale. He may be ill.
If you don’t have a guide, you could lose your way.
对正在进行的事情进行推测时，用“情态动词+be+动词的-ing形式”。如： There’s a lot of noise from the next door. They must be having a party. Hurry up! Mom might be waiting for us at home.
对过去的事情进行推测时，用“情态动词+have+动词的过去分词”。如： Laura looks very happy. She must have passed the exam. —I can’t find my wallet anywhere. —You might have lost it while shopping. Ⅳ. 中考链接
1. — Who’s singing in the garden?
— It __________ be Mr. Brown. He always practices singing at this time. A. must B. can’t C. need
(2014 湖南长沙) 2. —Is that Kate’s car?
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—It __________ be hers. She has just gone for a meeting. A. can’t B. should C. mustn’t D. may
(2014 湖北武汉) 3. —Where are you going this month?
—We __________ go to Xiamen, but we’re not sure. A. needn’t B. must C. might D. mustn’t
(2013 天津) Ⅴ. Practice
Work on 4a. Choose the best way to complete each sentence using the words in brackets.
1.让学生们理解句子意思。 1) A: Where’s Jean?
B: I’m not sure. She ______ (is/ might be/ must be) in the laboratory. 2) A: Everyone is going to the pool after school.【来源：21cnj*y.co*m】 B: Really? It _______ (must be / can’t be /could be ) hot outdoors. 3) A: That’s the phone.
B: Hmm. I wonder who it _______ (must be / could be / should be). 4) A: I wonder if there are Jim’s glasses.
B: They _______ (can’t be / might be / could be) his. He doesn’t wear glasses. 5) A: I hear water running in the bathroom.
B: It _______ (could be / must be / can’t be) Carla. She was thinking of taking a
shower.
2. 根据句意选择正确的情态动词。
3. 最后，通读一遍句子，进行综合理解，看句子内容是否通顺，合理。 4. Check the answers with the Ss.
Keys: might be, must be, could be, can’t be, must be 5. Explanation
1) be sure (of/about sth/doing) 确信...，对...有把握
be sure to do sth “ 必定”，“ 必然会”
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