(共28张PPT)
Module 11
Unit3 Language in use
Learning objectives
To learn the grammar - modal verbs
must/must not(mustn't)
can/cannot(can't)
need/need not(needn't)
You must say Mr or Mrs when you meet someone for the first time.
Language practice
You can take it away.
Language practice
You mustn't break anything.
Language practice
You needn't wait!
Language practice
Presentation
must (1)must表示说话人的主观意愿，意为“必须，应当”，无人称、数和时态的变化。
(2)以must开头的一般疑问句，其肯定回答用________；否定回答通常用________ 或____________，意为“________”。
(3)must的否定形式是mustn't，意为“________”，表示禁止或告诫。
(4)must还可以表示肯定的推测，意为“一定，肯定”。
must
needn't
don't have to
不必
一定不要
Presentation
can (1)can表示允许，意为“可以，能”，其否定形式为can't，意为“不能，不可以”。
(2)can还可以表示能力，意为“能，会”。
(3)can't表示否定的推测，意为“不可能”。
Presentation
need (1)need作情态动词，表示“________”，无人称、数和时态的变化，只用于否定句和________。否定形式为need not(needn't)，表示“不需要，不必”。
(2)以need开头的一般疑问句，其肯定回答用________，否定回答用________。
—Need I report it to the police office
需要
疑问句
must
needn't
Presentation
need 我需要向警察局报告这件事吗？
—Yes, you must./No, you needn't.
是的，你必须。/不，没必要。
(3)need也可作行为动词，表示“需要”，常用于need to do sth.结构。
Presentation
[辨析] must与have to
must与have to都表示“必须”，但must侧重说话者的主观看法，认为有必要或有义务去做某事；have to侧重于客观需要，含有“不得不，被迫”之意，否定形式为don't have to，表示“不必”。
All passengers must wear seat belts. 所有乘客都要系安全带。
He has to stop the car and wait for the policeman. 他不得不停车等那位警察。
Complete the conversations with can or can't.
1
1 A: Can you drive a car at the age of seventeen in England
B: Yes, we________. How about in China
A: No, we______.
2 A: Can you open a gift immediately after you receive it in England
B: _____________.What about in China
A: No, we usually don't.
can
can't
Yes, we can
3 A: Can you push your way onto a bus in England
B: _____________. How about in China
A: No, we________ either.
4 A: Can you drive on the right hand side of the road in
England
B: ____________. What about in China
A: Yes, we must.
No, we can't
can't
No, we can't
Complete the sentences with must or must not.
2
School rules
1 You __________ be late for school.
2 You __________ eat in the library.
3 You __________ ride your bike in the
playground.
4 You __________ do your homework.
5 You __________ listen to the teacher.
must not
must not
must not
must
must
Underline the correct words.
3
It is important to know what you must and must not do when you meet people from a different country.
You (1) may/must not ask Westerners “How old are you ” because it is not polite. You (2) might/can know someone well, but you (3) must/need not ask “How much money do you make ” He (4) may/can never speak to you again!
________
______
____
____
In public places, you (5) must/can ask people before you take photos of them, and you (6) must not/might not eat or drink in shops or museums.
In some countries you (7) cannot/can go into someone's house with your shoes on. You (8) need not/must not take them off. But in some other countries you (9) might/must not wear shoes in the house.
____
_______
____
_______
____
___
Listen to a teenager talking about his life. Check(√)
the things he must or mustn't do.
4
must mustn't
1 clean up bedroom once a week
2 wash up after dinner
3 stay out after 9 pm
4 do homework before going out
5 wash hands before dinner
6 play music loudly after 10 pm
√
√
√
√
√
√
Listen again. What two things does he say he can do
5
1 ____________________________________________
2 ____________________________________________
He can go out with his friends at weekends.
He can play music.
Write some things you can, must and must not do at home.
6
I can... I must… I must not...
Now work in pairs. Tell each other three things you must do at home and three things you mustn't do. Are your home rules different or the same
—I must visit my grandparents once a week. I mustn't stay up late in the evening.
—...
Exercise
Ⅰ.单项填空
( )1.[2019·北京]—Lily, ______ you finish the letter in ten minutes
—Yes, I can.
A．must B．should
C．need D．can
D
( )2.[2019·南充]—Mum, may I play computer games this evening
—No way, you ________ finish your homework.
A．can B．must
C．may D．will
B
( )3.[2019·梧州]—Must I clean my bedroom this afternoon, Mum
—No, you ________. You can do it tomorrow, dear.
A．needn't B．mustn't
C．can't D．won't
A
( )4.[2019·辽阳]—You ________ smoke at the oil station. It's too dangerous.
—I'm sorry, I won't.
A．couldn't B．needn't
C．wouldn't D．mustn't
D
( )5.[2019·宿迁]—Mum, may I go to see a film with my cousin
—You ________ go if you have finished your homework.
A．must B．need
C．should D．can
D
Ⅱ. 用must, can, can't或needn't填空
6．We________ study hard for the coming exams.
7．—Must I hand in my report today
—No, you________. You can hand it in this weekend.
8．—________ you skate on real ice
—No, I can't.
must
needn't
Can
9．—Who's the man Is he our teacher
—He ________ be our teacher. Our teacher has gone to Britain.
10．—May I watch TV, Dad
—When your homework is finished, you ________．
can't
can
GOOD JOB
