(共27张PPT)
Unit 8
It must belong to Carla.
语法精讲精练
Language goals
语言
能力
学习
能力
思维
品质
文化
意识
准确判断语境，在语言实践中运用情态动词做出正确推测。
1.掌握常用词汇及句型:
library;outdoor等;
2.能根据不同的理由来判断出
不同情态动词的语气.
通过观察讨论归纳，总结情态动词表推测的用法，提高思维的逻辑性。
1.通过观察归纳，正确理解和运用情态动词must, could, might, can’t .
2. 学会表推测的情态动词在实际生活中的运用。
1
2
3
4
Mike is talking with his wife about their travel plans.
Find out modal verbs for speculation.
Lead-in
It must be very expensive.
The people who do it must be very fit.
That might be fun.
It may be too challenging for us.
It could be dangerous.
It can't be that dangerous to go onsafari. So many people do it.
Look at these sentences.
情态动词
表推测
Lead-in
情态动词must，can，could，may和might均可表示推测，可以对过去、现在或将来的情况作出语气强弱不同的推测。
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.
Find out modal verbs for speculation.
Grammar Focus
The light in the teachers’ office is still on. Miss Gao ______ be working.
must表推测用在肯定句中
【注意】mustn’t “禁止, 千万不要”，不表推测。
情态动词 must表推测
Grammar Focus
You have worked all this week .You _______ be tired.
Students ________ go to swim in rivers by themselves.
You ________ late.
must
1.must. “一定；肯定”.表示_____________.
must
mustn’t
mustn’t
肯定猜测
______ it rain tomorrow It’s so sunny at the moment.
【拓展】could 表推测时，可用于肯定句、否定句和疑问句。
它比 can 更委婉，更不确定。
情态动词 can’t表推测
Grammar Focus
She ______be at school .It’s Sunday today.
He couldn’t have understood.
Where could it be
can’t
2.can’t，意为“不可能；应该不是”.表____________.
Can
can表推测
用在否/疑句
否定猜测
According to the radio ,it may/might/ rain this evening.
【注意】may not/ might not 表示不太有把握的否定推测，
意为“可能不”.
情态动词 may等表推测
Grammar Focus
Will you please answer the phone It may/might be your mom.
It might not be a bad idea to get a car alarm for your new sports car. You know new cars tend to attract thieves.
3.may , might, 表示“可能”.表示没有把握的推测.
might的可能性比 may要小一些。
Summarize the grammar rules.
Grammar Focus
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。
注意语气
拓展
Grammar Focus
1.情态动词+ do：
对现在或将来情况的推测。
He must be your uncle.
Don’t play with the knife. You could cut yourself.
I think Linda might travel in Beijing.
拓展
Grammar Focus
2.情态动词+ be + 动词-ing形式：
对此时此刻正在进行的情况进行推测。
注意时态
There’s a lot of noise from next door.
They must be having a party.
Mr. Wang is not in his apartment.
He might be working at factory.
At this moment, my father can’t be working in the office.
拓展
Grammar Focus
3.情态动词+ have + done:
对过去的情况进行推测。
It's wet on the road.It must have rained last night.
He is the best student in our class.
He can't have failed in the last week's exam.
Tom didn’t leave till three o’clock.
He may/might have missed the train.
拓展
Grammar Focus
4. “there+情态动词+be+主语+动词 -ing 形式”
表示“可能/或 许/一定……做……”。
There must be somebody helping us,
but we don't know who he is.
It is noisy,there might be some dogs barking.
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 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.
Choose the best way to complete each sentence using the words in the brackets.
could be
can’t be
must be
might be
must be
n.实验室
adv.在户外
Presentation
4a
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 ___________________________________.
Complete these responses.
Presentation
4b
n.外套
adj.困倦的
be interesting
cold
ill
must be delicious
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.
Presentation
4c
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.
Where is my school bag
When the school was over last Friday,
everyone went home happily.
But I couldn’t go home because my schoolbag was nowhere to be found.
Free talk
Where is my school bag
Who
Who could it be that took my schoolbag away Could it be Jim
No, it couldn’t be Jim, because Jim was playing football on the playground and his schoolbag was still there.
Free talk
Where is my school bag
I thought that...
It must be Linda that took my schoolbag
away, because she left the classroom hurriedly without saying goodbye to me.
Free talk
Where is my school bag
I thought that...
It might be John who took my schoolbag away, because he was the most careless student in my class. We all thought so.
Free talk
Where is my school bag
Guess what
I decided to go home. Just at that time, David rushed to the classroom out of breath, with my schoolbag in his hand, saying that he took it by mistake.
Don't be careless !
Free talk
一、单项选择.
1. — 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; mustn’t D. may; can’t
2. —Whose book is this
—It ___________ our geography teacher's. You see, his name is on it.
A. can't be B. can be C. mustn't be D. must be
3.—Oh, it’s raining hard.
—Be careful! The road ______ be wet.
A. could B. must C. might
Exercises
一、单项选择.
4.—We can see some wild animals in the forest, right
—It’s hard to say. There ________ be only a few left.
A．may B．must C．need D．could
5.—You did well in the high jump, Tina. You ________ have practiced a lot.
—Yeah. I trained hard at school for two months.
A．can B．could C．must D．might
6.—Where is Bob
—I’m not sure. He ________ be on the playground.
A．must B．can’t C．might
Exercises
二、完成句子.
1.Tony一定非常高兴见到你，你俩高中后就没见过了。
Tony ________________ overjoyed to see you. You two haven't seen each other since high school.
2. 他工作一直很努力，他现在肯定正在书房工作。
He always works very hard, and he ______________________ _ in the study.
3. —听！房间里是凯特在弹钢琴吗？
—不，不可能是她。她和她父母去伦敦了。
—Listen! Is that Kate playing the piano in the room
—No, it _____________ be her. She has gone to London with her parents.
Exercises
must be working
must be
can’t
Summarize the grammar rules.
Summary
注意语气和时态
Level B：
Remember the grammar points we’ve learnt today.
Level A：
Make up sentences with must/could/might/can’t to make inferences according to 4c.
Homework
老师：XXX
班级：XXX
See you !
