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(共28张PPT)
Unit 4 Don’t eat in class.
Section A Grammar Focus-3c
人教新目标版 七年级下
warm up
Let’s watch a video about David.
Lead in
There are so many rules that David must follow. Can you find these rules
Let’s look at these sentences.
No yelling!
Don’t chew gum in class!
No pushing!
No running!
Sit down!
Raise your hands!
Keep your hands to yourself!
Wait your turn!
Lead in
What do they have in common
No yelling!
Don’t chew gum in class!
No pushing!
No running!
Sit down!
Raise your hands!
Keep your hands to yourself!
Wait your turn!
缺少主语
表示命令、请求、劝告、警告和禁止等的句子。
祈使句
imperative sentence
Lead in
we can use imperative sentence to tallk about rules.
[ m per t v] 祈使语气
There are mnamy rules in the classroom and library.
Don’t be/arrive late for class.
Don’t run in the hallway.
Don’t eat in class.
Lead in
Don’t listen to music in class.
Don’t fight with your classmates.
Listen to the teacher carefully.
How about the rules in the library
Don’t talk.
Don’t eat in the library.
Don’t listen to music in the library.
Don’t take photos in the library.
Lead in
What should we do in a library
Lead in
Read and speak quietly.
Please wait in line.
Behave yourselves!
Presentation
Observe this chart and let’s read the sentences.
Grammar Focus
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.
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 Focus
Can you find four modal verbs
must/can/have to+v.原形
can表许可
must强调主观意愿，表示“必须”
have to强调客观意愿，表示“不得不”
Grammar Focus
How do we change them into negative ones (否定形式)
can表许可
must强调主观意愿，表示“必须”
have to强调客观意愿，表示“不得不”
can’t 表不允许
mustn’t 表“禁止”
don’t have to
表“没必要”
无人称和
时态变化
有人称和
时态变化
Let’s translate some sentences.
Grammar Focus
1.学生禁止在河里游泳。(mustn’t)
2.Cindy周末没必要早起. (don’t have to)
3.John不能在教室打篮球。
Students mustn’t swim in the river.
Cindy doesn’t have to get up early in the morning.
John can’t play basketball in the classroom.
Grammar Focus
What are imperative sentences How many types of imperative sentences
祈使句的类型
Get up
Be careful!
Give that to me.
把那个给我
Eat your breakfast.
Help!
Read this book.
起床
救命啊！
吃你的早餐
读这本书
小心！
1.以实义动词原形开头。
2.以Be动词原形开头。
How can we make it more polite
Grammar Focus
Please close the door.
come in, please.
3. Please用在句首或句尾。
请关门
请进
Today is Monday.
Let’s clean the classroom!
It’s cold.
Let’s not go out.
4. Let's+V.原形， 表示建议.
让我们打扫教室吧！
我们别出去了。
祈使句的否定形式
Grammar Focus
Don’t fight with your classmates.
Don’t run in the hallway.
Don’t eat in class.
Don’t listen to music in class.
No swimming！
No smoking！
No photos！
No parking！
Summary
Do型：动词原形+（宾语）+其他.
肯定结构
否定结构
Be型：Be+表语+其他成分.
Let型：Let+宾语+动词原形+其他.
Don’t型：Don’t+动词原形+（宾语）+其他.
Don’t+Be+表语+其他成分.
Don’t+Let+宾语+动词原形+其他.
Let+宾语+not+动词原形+(其他)。
Please型：Please+动词原形+其他.
动词原形+其他, Please.
No型：No+名词
祈使句
3a
Write the rules for the school library.
Library Rules
1. ____________________________
2. ____________________________
3. ____________________________
4. ____________________________
Don’t talk.
1
2
3
4
Don’t eat in the library.
Don’t listen to music in the library.
Don’t take photos in the library.
Presentation
3b
Listen. What rules are these students breaking Write the numbers after the names.
Be quiet
Q: Does she have to be quiet in the library
(she/have to/in the library)
A: Yes, she does.
Eat
Q:_________________________________
(he/have to/in the dining hall)
A:_________________________________
Listen to music
Q:_________________________________
(we/can/in the hallways)
A:_________________________________
Wear a hat
Q:_________________________________
(we/can/in the classroom)
A:_________________________________
Does he have to eat in the dining hall
Can we listen to music in the hallways
Can we wear a hat in the classroom
Presentation
Presentation
wear a hat
Listen to music
Eat
Do we have any library rules in our school Ask and answer in pairs.
Do you have to... in the library
Yes,.../No,...
Be quiet
Presentation
the students/have to/clean classroom/every day
she/have to/be at home/at five o’clock
she/have to/do morning reading/every day
we/can/arrive at school/late
Make more conversations using these words.
3c
Presentation
Make up five cool rules for your dream school. Share your rules with the class. Your classmates vote for the Coolest School!
1.We can eat in class.
2.We don’t have to come to school every day.
3. ...
At my dream
school, we don’t have
to come to school
every day. We...
Exercises
一、单项选择。
( ) 1. David, _______ make trouble at school.
A. can’t B. don’t C. doesn’t
( ) 2. —Mom, can I play computer games this evening
—_______ your homework first, and then we’ll talk about it.
A. Finishing B. Finish C. To finish D. Finished
( ) 3. Buses _______ stop when the traffic lights turn red.
A. can B. may C. must
B
B
C
Exercises
( ) 4. We should keep quiet in the library. We _____ speak loudly( 大声地).
A. must B. mustn’t C. can D. needn’t
( ) 5. I _____ go now, or I’ll miss my train.
A. can B. might C. must D. could
( ) 6. He _____ stay at home, because it’s raining outside.
A. have to B. has to C. must D. can’t
B
B
C
Exercises
二、句型转换（每空一词）。
1. Talk in class. (改为否定句)
______ ______ in class.
2. I have to do my homework after school. (对画线部分提问)
______ ______ you ______ ______ ______ after school
3. We have to listen to the teacher. (改为一般疑问句并作肯定回答)
______ we ______ ______ listen to the teacher
______, we ______.
Don’t
talk
Do
have to
What
do
have to do
Yes
do
Exercises
4. She has to wear the uniform at school. (改一般疑问句，并肯定回答)
_____ she _____ to wear the uniform at school
_____, she _____.
5. We can run in the hallways. (改为否定句)
We _____ run in the hallways.
Yes does
Does have
can’t
Homework
1. Write down ten sentences about what you can or can’t do in yourhouse.
3. Finish the exercises in the workbook.
4. Preview (Section B (1a-1d)).
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