Unit 8 It must belong to Carla. Section A(Grammar Focus-4c)课件(共20张PPT)

(共20张PPT)
Unit 8
It must belong to Carla.
Section A (Grammar Focus-4c)
To learn to understand and use must, might, could
To use modal verbs to make inferences
Lead in
My name is Mary. There is a picture of my family. Do you know whose bedroom it is
It ________ Mary’s.
It ________ Mary’s sister’s.
It ________ Mary’s parents’.
may be
must be
can’t be
Presentation
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.
表示推测的情态动词
在英语中，表示对某件事物的确定程度，即表示推测的时候，表示可能、怀疑、允诺、愿望、义务、必要、猜测等的动词就是情态动词。英语中表示推测的情态动词主要有must, can, could, may, might等。
可能性: must > can/could > may/might
can not (can’t)
could not (couldn’t)
may not
might not
情态动词表推测
情态动词表示推测时，无时态区别，只有语气差别
1. must表示可能性最大的肯定推测，意思是“一定、准是”。含有must的句子（表推测）变为否定句时，要用can’t。
must一般疑问句的否定回答用needn’t或don’t have to，而不用mustn’t。
mustn’t意为“不可以，不能”，表示禁止，不许可
He must know the answers. /He can’t know the answers.
e.g. — Must we hand in our exercise book today
— Yes, you must. ( No, you needn’t.)
must还可表示有把握的推测，意为“一定、肯定”。must的过去式还是must。在回答以must开头的一般疑问句时，否定式需用needn’t，表示“不必”的意思。
2. can可表示能力/允许/可能性/怀疑猜测，意为“可以，会，能”；can’t意为“不会，不能，不可以,不可能”
could为can的过去式；could还可用于现在时态中表示委婉客气，相当于can；could也可表示惊讶怀疑，不相信。
He can’t pick her schoolbag up.
They can be reading in the library.
could 表示某事有可能发生或可能是事实。
Don’t eat it. It could go bad.
The plane could be put off by the storm.
could 还可用于表示客气、礼貌、委婉的请求语气Could you please help me with my homework
3.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。
He may / might not be at home, but I’m not sure.
情态动词表示推测的意义和用法
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 表示没有把握的推测
否定句 couldn’t/can’t 不可能 表示有把握的否定推测
may not/ might not 可能不 表示不太有把握的否定推测
疑问句 can/could 可能 表示推测
不同形式的情态动词表示不同的含义
情态动词+动词原形 表示对现在事情的推测
情态动词+be+动词-ing
情态动词+have+动词的过去分词
表示对正在发生的事情的推测
表示对过去情况的推测
This book must be Jim’s because his name is on it.
My mother might be cooking in the kitchen.
The ground is wet. It must have rained last night.
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.
might be
must be
4a
Practice
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
could be
1. A: Many people are wearing coats.
B: The weather must be _________________________.
2. A: Sally has been coughing a lot.
B: She might be _____________________.
getting colder/ cold outside
having a sore throat/ill
Complete these responses.
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
4b
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.
4c
中考链接
用情态动词的正确形式填空
After a long walk, you ______ feel tired.
The man ______ be Mr. Li. He went to HK yesterday.
My mom __________________ go to visit grandpa. I am not sure of it.
The notebook ______ be Mary’s because it has her name on it.
must
can’t
may/might/ could
must
1. must, can /could, may /might等情态动词表推测
肯定推测：
must, can / could, may / might都可以表示肯定推测
must 表示把握性极强的推测，意为“肯定、一定”
can / could和 may / might表示把握性不大的推测，意为“也许、可能”。
否定推测：
can’t 意为“不可能”，表示很有把握的否定推测
may not意为“可能不”，表示把握性不太大的否定推测
Summary
1. Review grammar and remember the usage of “can’t be, may/ might/ could be; must be”.
2. Preview Section B.