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Unit 8 It must belong to Carla（第3课时）
【学习目标】
1) 学习掌握下列词汇：laboratory, coat, sleepy, pocket
2）进行一步复习巩固学习Section A 部分所学的生词和词组。
3）掌握情态动词的用法和物体所属的句型。
【自主梳理】
Key Vocabulary
laboratory, coat, sleepy, pocket
【重点领悟】
1) 复习巩固Section A 部分所学的生词和词组，达到熟练运用的目标。
2) 总结情态动词的用法。
【探究提升】
情态动词表推测，可能性：must> can/could> may/might
一、must
表示可能性最大的肯定推测，意思是“一定、准是”。只能用于肯定句。如果要表示“一定不”，应该用can't。如果询问可能性时，应该用can。
e.g. He must know the answers. 他肯定知道答案。
He can't know the answers. 他肯定不知道答案
Can he know the answer? 他知道答案吗？
二、can/could
can表示推测“可能性”时，一般用于否定句或疑问句。can在疑问句中意思是“会，可能”。
e.g. He can’t pick her schoolbag up. 他不可能拿了她的书包。
could 用于表示某事有可能发生或可能是事实。
e.g. Don’t eat it. It could go bad. 不要吃它，可能坏了。
The plane could be put off by the storm. 这趟飞机可能会因为暴风雨而推迟。
could可用于表示客气、礼貌、委婉的请求语气。
Could you please help me with my homework？你能帮我完成我的家庭作业吗？
may, might表示推测“可能性”时，意思是“可能”，“也许”。might不表示过去时态，语气更委婉，可能性更小。may, might表推测时，可用于否定句，但不用于疑问句。
e.g. He may/ might not be at home, but I'm not sure. 他可能不在家，不过我也不确定。
四、推测时态
1. must: 推测现在/ 正在/ 过去发生的动作。
e.g. He must have a car now.
(现在) 他一定有一辆小汽车。
He must be finishing his homework at home.
(正在进行) 他一定在家做作业。
He must have finished the work.
(过去) 他一定已完成了工作。
2. can
can/ can’t 后可接进行时/完成时，表示对现在发生的动作或过去发生的动作进行推测。
e.g. They can’t be reading in the library. 他们一定不在图书馆读书。
He can’t have gone to Shanghai because I saw him just now.
他不可能去了上海，我刚看见他了。
3. may/ might
may，might 可以推测现在正在发生的动作或过去发生的动作，还可以推测将来的情况。
e.g. He may/might be sleeping now.
(现在) 他可能正在睡觉。
These people may/might have seen the film before.
(过去) 这些人以前可能看过这部电影。
It may rain. There are some clouds.
(将来) 可能会下雨。因为有一些乌云。
Work on 4a. Choose the best way to complete each sentence using the words in brackets.
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.
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”, "准会"
(2) 表示“位移”的动词用现在进行时态表将来，例如：go去，come来，leave离开，arrive到达，return 回来，fly 飞。
(3) wonder v. “想知道”（want to know）
No wonder + 句子 “难怪.....”
e.g. No wonder you are angry. 难怪你觉得生气。
(4) think of 想要；打算
e.g. I thought of playing basketball. 我想打篮球。
Work on 4b. Complete these responses.
- Tell Ss to understand the sentences.
1. A: Many people are wearing coats.
B: The weather must be ____.
2. A: Sally has been coughing a lot.
B: She might be _______.
3. A: This restaurant is always very crowded.
B: The food ________________.
4. A: Whenever I try to read this book,
I feel sleepy.
B: It can’t _____________________.
- Let Ss write down possible answers as much as possible.
- Let Ss check their answers with their partners.
- Check the answers together.
Keys: cold, sick/ ill, must be delicious, be interesting/ attractive
【巩固训练】
1. — Excuse me. Is this the right way to the Summer Palace?
— Sorry, I am not sure. It ________ be.
A. might B. will C. must D. can
2. — Isn’t that Ann’s husband over there?
— No, it ____ be him—I’m sure he doesn’t wear glasses.
- can’t B. must not C. won’t D. may not
3. You ______ be tired—you’ve only been working for an hour.
A. must not B. won’t C. can’t D. may not
4. — Is John coming by train?
—He should, but he _______ not. He likes driving his car.
A. must B. can C. need D. may
Keys: AACD
【学习反思】
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