资源简介

(共33张PPT)
Grammar
Key question
主题范畴：人与自然
What role does electricity play in our daily lives
Unit 6 Electricity everywhere
Please watch a video and
find out what we are going to learn today!
Modal verbs情态动词
can
cannot (can’t)
may
may not
must
must not
ability
能
obligation
必须
permission
可以
Observe and think
1. What is the form of the verbs after modal verbs
2. What does the modal verb mean in each sentence
can and cannot
We can use electricityto do many things. Can you think of an example
-Yes, I can./ No, I cannot/can't.
Modal verbs情态动词
We use can and cannot (can’t) to say we are able or unable to do something.
P139
can 的用法
①表示能力，意为“能，能够”
I can speak Spanish.我能讲西班牙语。
②表示“请求许可”，意为“可以”，多用于口语
Can I come in 我可以进来吗？
③表示“有时会”，表示偶尔发生的情况
Guangzhou can be cold sometimes.广州有时会很冷。
④表示“可能性”，表达推测，通常用于否定句或疑问句。
That can’t be Mary. She is in the hospital.
那不可能是玛丽，她在医院。
彼特能够说英语。
肯定句→Peter can speak English.
否定句→Peter can’t/cannot speak English.
一般疑问句→Can Peter speak English
特殊疑问句→What can Peter speak
含有can 的句子结构
Hi and Lo are talking about themselves. What are they saying Read their conversation and then complete the statements below with can or cannot.（P77）
1. Hi _____ play football.
2. Lo ______ paint.
3. Hi ______ speak as many languages as Lo.
4. Both Hi and Lo _____ dance.
5. Lo ______ drive a car, but he _____ play chess.
6. Hi ____ swim, but he ______ play the guitar.
can
can
can
can
cannot
cannot
cannot
cannot
You may / can turn on the TV.
You may not / cannot play in the kitchen.
-May / Can I use your mobile phone
Yes, you may / can. / No, you may not / can't.
may and may not
We use may and may not to ask for and give permission (许可).
We also use can and cannot (can’t) for the same purpose (目的).
P139
①表示请求同意，意为“可以”，用于疑问句中。
— May I use your phone
— No, you can't.
— 我可以借你的手机吗？
— 不，你不可以。
②表示可能性。may表示的可能性比can小。
Anna may know my phone number.
安娜可能知道我的电话号码。
may的用法
注意：may构成的一般疑问句及其回答形式如下：
我可以在这里拍照吗？
May I take photos here
— (肯定回答) Yes, you may / can.
— (否定回答) No, you may not / can’t /mustn’t.
(注：mustn’t 的语气最强，表示禁止)
Daisy is not feeling well today. Benny is at home with her. Read their conversation below. Fill in the blanks with may or can.
Benny: How are you feeling, Daisy
Daisy: Not very well.
Benny: __________ I get you a chair
Daisy: Yes, thanks.
Benny: I’m going out. _____ I borrow your bicycle, Daisy
Daisy: Yes, you may. Before you go to meet your friends,
can you come and see the doctor with me
Benny: Yes. I _____. ______ I carry your bag for you
Daisy: Yes, that’s very kind of you, Benny.
I’m ready to go.________ you open the door for me
Benny: Yes, I can.
Daisy: Thanks.
May
May
Can
Can
May/Can
must and must not
We must always be careful with electricity.
We mustn't touch electrical appliances with wet hands.
—Must I come over now
—Yes, you must.
—No, you needn't.(needn’t = don't have to)
We use must and must not/mustn’t to tell people what to do or what not to do.
P139
What do these signs mean
You mustn’t smoke here.
You mustn’t fish here.
You mustn’t use your mobile phone here.
You mustn’t take photos.
①表示规定，命令，强制，意为“必须；一定”，多指现在或将来的情况，指说话人的主观语气，其否定形式表示“禁止”。
如：
你必须先做作业。
You must do your homework first.
你不许在这里吸烟。
You mustn’t smoke here.
must的用法
②表示猜测，意为“一定是”，“准是”，常指有根据的，比较有把握的推测，仅用于肯定句。
Jack and Dick must be twins. They look so much alike!
杰克和迪克准是双胞胎，他们长得太像了。
注意：
must 构成的一般疑问句及其回答形式如下：
我必须现在交作业吗？
— Must I hand in the homework now
— (肯定回答) Yes, you must.
— (否定回答) No, you needn’t./No, you don't have to.
辨析must和have to
意义 形式 用法
must “必须；一定” 只有must 强调主观上必须做某事
have to “ 不得不；必须” have有各种时态和数 强调客观上不得不做某事
含义：情态动词是一种本身有一定的词义，表示说话人的情绪，态度或语气的动词，但不能单独作谓语，只能和其他动词原形构成谓语。
1. 情态动词________（有/无）人称和数的变化；
2. 情态动词后面跟的动词须用________；
3. 否定式构成是在情态动词后面加 “________”。
4. 使用一般疑问句只需把情态动词_____________,其余不变,句号改为问号。
无
原形
not
置于句首
Summary
情态动词 用法 否定形式 疑问句及回答 共同点
can 表示具有某种能力，意为“能”，非正式场合也可以表示许可，相当于“may” cannot/ can’t 不能 --Can... --Yes,...can. --No,...can't. 情态动词后要使用动词原形
may 表示请求，允许，意为“可以” may not 不可以 --May... --Yes,...may. --No,...may not/ can’t/mustn’t. must 用来指定规则或者发出命令，意为”必须“ must not/ mustn’t 禁止 --Must... --Yes,...must. --No,...needn’t/ don’t have to. can/may
can
can/may
can/may
can
can
can
can
can
may/can
must
Can
can’t
must
mustn’t/can’t
must
can’t
P139
Can
can
must
mustn’t/can’t
mustn’t/can’t
May/Can
can/may
may/can
must
must
You must listen carefully to the teachers.
You mustn’t sleep in class.
You must keep the classroom clean.
You mustn’t throw rubbish on the floor.
More Exercise
1. A: Dad, _____ I watch TV after school today
B: Yes, you can, but you can’t watch TV too long.
2. A: What _____ I do for you, madam
B: I want to learn music. What music lesson can I have
3. A: May I use your dictionary
B: Yes, you _____.
4. A: _____ I clean my bedroom now
B: No, you needn’t. You can do it one hour later.
5. A: Can I play basketball with my classmates this Saturday, Mom
B: Sorry, you _____. We have to visit your grandparents this Saturday.
6. A: Must I drink milk every day
B: Yes, you _____. It is good for you.
I. 从can,can’t,may,may not,must和mustn’t 中选择最恰当的词填空。
may
can
can
Must
can’t
must
Dora and her parents are going on a holiday to France next week. Each member of the family (1)________(must; mustn't) do different things to get ready.
Her mother Mrs Black (2)________(must; can) speak French and English, so she will go to the French Embassy (大使馆) to get visas (签证) for the family today. She can’t (3)_______ (forget; forgets) to take all passports (护照) with her, or they will not get visas. She (4)________(may; must) get there before the embassy closes. Dora and her dad are in the bank now. They need to change money at the bank. There are many people in the bank and they must (5)_______ (waits; wait) in the bank for a long time.
II.根据文段内容，从括号中选择合适的词填空
must
can
forget
must
wait
Summary
In this class, we have learned
how to use can and cannot.
how to use may and may not.
how to use must and must not.
Self-assessment
How well do you know about this lesson Tick the boxes.
① I can use can and cannot correctly. 口 口 口
② I can use can and cannot correctly. 口 口 口
③ I can use can and cannot correctly. 口 口 口
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