Unit 8 It must belong to Carla. Section A 4a-4c课件(共23张PPT)

(共23张PPT)
Unit 8 It must belong to Carla. Section A 4a-4c
● To learn must, might, could and can’t
for making references
Learning Objectives
Revision
感到不安
玩得高兴；过得愉快
起初
走开；离开
不寻常的某些事
在社区里
1. feel uneasy
2. have fun
3. at first
4. go away
5. something unusual.
6. in the neighborhood
Warm-up
Guess what’s this
I think it might be ...
can be...
must be...
could be
a cat
a dog
a bear
Presentation
Grammar Focus
Whose volleyball is this It must be Carla’s. She loves volleyball.
Whose hair band is this It could be Mei’s hair band. Or it might belong to Linda. They both have long hair.
What did you see that night I’m not sure, but it can’t be a dog. It was bigger. I think it might be a bear or a wolf.
情态动词表示推测
[探究]情态动词表推测
1.概念： 情态动词can, could , may, might, must都可以用来表示说话人对某事的推测。
2.结构：情态动词+动词原形（此时动词原形通常为
be）。
[探究] 含情态动词表推测的用法
句式 情态动词 含义 用法
肯定句 must 一定 表示有把握的肯定推测。
may/ might/ could 也许；可能 表示没有把握的肯定推测。
否定句 can’t/ couldn’t 不可能 表示有把握的否定推测。
may not/ might not 可能不 表示不太有把握的肯定推测。
疑问句 can/ could 可能 表示推测。
（1）情态动词表示推测时，无时态区别，只有语气差
别。表示推测的情态动词的语气强弱顺序如下（由强
到弱）：
must ＞ can ＞ could ＞ may ＞ might
（2）含有must的句子（must表推测）变为否定句时，
要用can’t。
（1） 情态动词+动词原形：表示对现在事情的推测。
You must be hungry after a long walk.
（2）情态动词+be+动词-ing：表示对正在发生的事情
的推测。
They must be waiting for us. Let’s hurry up.
（3）情态动词+ have +动词的过去分词：表示对过去情况的推测。
[探究] 不同形式的情态动词表示不同的含义
can 不肯，
may 不问，
must 肯定不否问
即：can(could)一般不用于肯定句； may(might)一般不用于疑问句；must 一般仅用于肯定句，不用于否定句和疑问句。
[口诀] 情态动词表推测顺口溜
活学活用
—Who is singing in the next room Is it Mary
—No, it _____ be her. She has gone to New York.
A. can’t B. must C. shouldn’t D. can
A
Choose the best way to complete each sentence using the words in brackets.
4a
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.
might be
must be
3. A: That’s the phone.
B: Hmm. I wonder who it _____________ (must be /
could be / should be).
4. A: I wonder if these 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.
could be
can’t be
must be/ could be
4b
Complete these responses.
1. A: Many people are wearing coats.
B: The weather must be ________________________.
2. A: Sally has been coughing a lot.
B: She might be ______________________________.
ill/having a sore throat
getting colder/ cold outside
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 ____________________________________.
must be delicious
be that boring
4c
Look at this picture of a room. How much can you tell about the person who lives here Is it a boy or a girl What are his/her hobbies Discuss your ideas with a partner.
A: It could be a girl’s room because it’s
very tidy.
B: I guess so. But it might be a boy’s room because the clothes look like boys’ clothes.
It could be a girl’s room because it’s
very tidy.
I guess so. But it might be a boy’s room because the clothes look like boys’ clothes.
I can see a girl in the picture. I think it must be a girl’s room.
I guess not. But it might be a boy’s room because in general boys like CD more than girl.
—Difficulties always go with me!
—Cheer up! If God closed a door in front of you, there _____ be a window opened for you.
A. would
B. must
C. could
D. can
B
Exercises
2. —Look at the boy playing basketball on the ground.
Is it George
—It _____ be him. He told me he would play
basketball after class, but he’s not sure.
A. mustn’t
B. must
C. can’t
D. may
D
Summary
情态动词
表推测
否定句
疑问句
肯定句
结构：
对现在
对正在进行
对过去
时态：
can 不肯，
may 不问，
must 肯定不否问
情态动词+动原
情态动词+ be+doing
情态动词+have done
GOOD JOB