(共23张PPT)
Unit 4
Don't eat in class.
Section A(Grammar Focus-3c)
No swimming
No smoking
No parking
Do you know these signs?
No walking
No bike riding
No photos
No cell phones
SCHOOL RULES 校规
1. Don’t arrive late for class. You must be on time.
上课不要迟到。你必须按时。
2. Don’t run in the hallways.
不要在走廊上跑。
3. Don’t eat in the classroom. You can eat in
the dining hall.
不要在教室吃东西,你必须在餐厅吃。
4. Don’t listen to music in class.
不要在课上听音乐。
5. Don’t fight. 不要打架。
Don't run in the hallways. Don't fight.
What are the rules? We must be on time for class.
Can we eat in the classroom? No, we can't, but we can eat in the dining hall.
Can we wear a hat in class? Yes,we can. / No,we can't.
Does he have to wear a uniform at school? Yes, he does. / No, he doesn't.
What do you have to do? We have to be quiet in the library.
Grammar
一. 情态动词have?to?的用法
（1）结构: 主语＋have?to＋动词原形＋其他
主语是第三人称单数时, 用has?to；
We?have?to?wear?sports shoes?for?P.E.?class.?
在体育课上， 我们必须穿运动鞋。
Tom?has?to?practice?playing the?guitar?every?day.?
汤姆每天必须练习弹吉他。
（2）否定形式:
主语＋don’t(doesn’t)?have?to＋动词原形＋其他
Nick?doesn’t?have?to?wear?a?uniform.
尼克不必穿制服。
我们不必马上完成作业。
（3） 疑问句:
Do(Does)＋主语＋have?to?＋动词原形＋其他
— Do?you?have?to?stay?at?home?on?weekends??
周末你必须待在家里吗？
—Yes,?I?do.?/?No,?I?don't.?
是的，我必须。/ 不，我不必。
We?don’t?have?to?finish?our?homework?at?once.
一：情态动词must与have to
1.must:表示说话人的主观看法，即主观上的必要性，还用来表示命令和愿望。
You must finish your homework.
你必须做完你的作业。
2.have to ：表示客观需要，即周围的环境、习惯等要求某人不得不或必须去做某事。
He has to walk to school every day.
他每天必须走路去上学。
注：must只用于现在时，在表示过去、将来和完成时，用have to的相应形式来代替must。
I had to get up early yesterday.
我昨天必须早起。
3.have to 否定形式 为 don’t /doesn’t have to，
相当于needn’t，意为“不必”；
must 否定形式为 must not，缩写为
mustn’t，意为“千万不要，禁止”。
You don’t have to go school today.
你今天不必去学校。
4. 由 must 引导的一般疑问句的否定回答不用mustn’t，而要用 needn’t 或 don’t/doesn’t have to。
— Must I finish all the homework today?
我今天必须要完成所有的作业吗？
—Yes, you must.
是的，你必须。
—No, you don’t have to/ needn’t.
不，没有必要。
1. — I do the dishes first?
—No, you . You can do your homework first.
A. Must; mustn’t B. Can; mustn’t
C. Must; needn’t D. Must; must
C
2. Students must ______for class.
A. on time B. be on time C. late D. be late
B
3.My sister ______ be at school by seven o’clock.
A. has to B. have to
C. had to D. must to
A
Write the rules for the school library.
3a
Library Rules
Don’t talk.
_________________
_________________
_________________
Don’t listen to music.
Don’t eat or drink.
Don’t take photos.
Use the words to make questions about the rules. Then write answers according to your school.
3b
Be quiet? (she/have to /in the library)
Q: Does she have to be quiet in the library?
A: Yes, she does.
2. Eat? (he/have to/in the dinning hall)
Q: __________________________
A: __________________________
Does he have to eat in the dining hall?
Yes, he does.
Listen to music? (we/can/in the hallways)
Q: __________________________
A: __________________________
4. Wear a hat? (we/can/in the classroom)
Q: ________________________
A: ________________________
Can we listen to music in the hallways
No, we can’t.
Can we wear a hat in the classroom
No, we can’t.
3b
We can eat in class.
We don’t have to come to school every day.
…
Make up five cool rules for your dream school. Share your rules with the class. Your classmates vote for the Coolest School!
At my dream school, we don’t have to come to school every day. We …
Press conference
3c
Talking
Report
At my dream school, we don’t have to come to school every day. We can eat in the classroom. We can listen to music in class. We don’t have to do homework. We don’t have to wear the school uniform at school.
根据句意，用can和can’t填空。
1. Mr. Green_______ smoke here because there’s a sign on the wall. It says “No smoking.”
2. It’s very hot outside. You______ wear a hat.
can’t
can
3. We _______ eat in the classroom because it’s impolite to teachers.
4. I ______ go to bed after 11:00 on school night.
5. The students _____ read books and magazines in the library.
can’t
can
can’t
用have to或has to填空。
1.We ________ clean our classroom after school.
2.She _________ make her bed after getting up.
3.It’s late. Mr. Beckman ________ go to work by car.
4.Emily and Peter join a music club. They __________ practice the guitar every day.
have to
have to
has to
has to
一、单项选择。
1. ____ listen to music in the classroom.
A. Not B．No C．Don't
2. Tom，please ____ the classroom now.
A. clean B．to clean C．cleans
3. Let's ____ on time for classes.
A. be B．be not C．are
4. She has to ____ her homework every night.
A. does B．do C．doing
5. Sorry，you ____ play basketball in the classroom.
A. can't B．don't C．don't have to
C
A
A
B
A
二、按要求完成句子。
6. Lily can play the guitar.(改为一般疑问句并作否定回答)
—_____ Lily _____ the guitar?
—____，she ______．
7. Jack has to play the piano every weekend.(改为一般疑问句)
_____ Jack ________ play the piano every weekend?
8. Be quick.(改为否定句)
__________________________________
9. You can't eat food in class.(改为祈使句)
___________________________________
10. You can't be late for class next time.(改为祈使句)
_____________________________________
Can
play
No
can't
Does
have to
Don't be quick.
Don't eat food in class.
Don't be late for class next time.
11. He has to eat breakfast quickly. (改为一般疑问句)
____________________________________________
12. Play volleyball after class. (改为否定句)
___________________________________________
Does he have to eat breakfast quickly?
Don’t play volleyball after class.
13. We can wear sports shoes in class. (改为一般疑问) ___________________________________________
14. Don’t arrive late for class. (改为同义句)
____________________________________________
15. Eric has to do his homework before six. (对划线部分提问)
____________________________________________
Can we wear sports shoes in class?
You must be on time for class.
What does Eric have to do before six?
本节课学习了祈使句的用法，以及have to的基本用法和否定表达。同时，通过can和can't的练习训练，使学生熟悉利用相关词汇进行口头表达。
Summary
谢谢
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中小学教育资源及组卷应用平台
Unit 4 Don’t eat in class.
Section A(Grammar Focus-3c)同步练习
一、根据句意及首字母提示写单词。
1．There are some _________ in the school library.
2．Jack has to __________ his sports shoes in the P．E. class.
3．I'm very ________ for using your computer without asking.
4．Remember(记住) to ________ your exercise book here tomorrow.
5．It's cold ___________．Please come into the room.
二、单项选择。
( )6.—Where are your classmates?
—They're in the ________ to have lunch.
A．library B．classroom
C．music room D．dining hall
( )7.Nancy can't come here，because she ________ do her homework.
A．has to B．can't C．doesn't have to D．can
( )8.________ watch TV.You have to take the piano lesson now.
A．Do B．Don't C．Don't do D．Can't do
( )9.Which of the following signs means “No Photos”？
( )10.—________？
—We have to stay at home.
A．What can you do
B．What can I do for you
C．What do you like to do
D．What do you have to do
三、按要求完成下列句子。
11．Can you ride your bike at school？(作否定回答)
______，I _______．
12．You can't fight with your classmates.(改为同义句)
_________ _________ with your classmates.
13．Mary has to help her mum with cooking.(改为一般疑问句)
______ Mary _________ ______ help her mum with cooking?
14．We have to clean the windows every day.(改为否定句)
We ________ _________ ________ clean the windows every day.
15．I have to play the guitar on Sundays.(对画线部分提问)
_______ _____ ________ have to _____ on Sundays?
四、根据汉语意思完成下列句子。
16．我得先做作业。
I _________ _____ ______ my homework first．
17．请保持安静。
Please __________ _______．
18．他上课总是迟到。
He ____ always _______ _______ class.
19．图书馆的规则是什么？
______ _______ the _________ _______ ?
20．玛丽喜欢听音乐。
Mary likes to ________ ______ music.
参考答案：
一．1.rules 2.wear 3.sorry 4.bring 5.outside
DABDD
三．11.No; can’t 12.Don’t fight 13.Does; have to 14.don’t have to 15.What do you; do
四．16.have to do 17.keep/be quiet 18.is; late for
19.What are; library’s rules 20.listen to
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