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(共25张PPT)
Unit 2
SectionA (3a---3d)
No rules,no order.
过本课时学习，学生能够：
1.通过观察和分析示例句子，深入理解并准确辨析祈使句和情态动词的表意功能。(学习理解)
2.掌握并运用祈使句和情态动词表达规。(应用实践)
3.熟练运用祈使句和情态动词can, must,have to介绍规则。(迁移创新)
Learning objectives：
Lead in
Tom is an exchange student in our school.
How can he become a good student
follow the school rules!
Lead in
follow the school rules
Grammar Focus
祈使句
含有情态动词的句子
Read the sentences again . Do the verbs in
bold need to change forms Why
在祈使句和情态动词后，动词均用原形
Presentation
祈使句的特点
1.通常省略主语_____.
2.其肯定形式常以_________开头，否定形式是__________.
3.祈使句句尾用____号或_______号。
You
动词原形
Don't+动词原形
句
感叹
祈使句的分类
Be polite .
Don ' t run !
Walk in the hallway .
Don ' t litter .
Treat one another with respect .
Let's arrive at school on time.
No smoking!
DO型
Be型
Let型
No型
Let me help you. Don't let him go.
Exercises
1. It ' s an important meeting .__________( not , be ) late .
2. ________ ( not , make ) any noise ! Your mother is sleeping .
3.________(look)out , a car is coming.
4. The notice on the wall says " _______".( no smoke )
Don't be
Don't make
Look
No smoking
情态动词 含义及用法 例句
can 表示________，意为________ I can say"nihao" in different languages.
表示________，意为________ Can we eat snacks in class
can't 表示______，意为________ we can't eat in class.
能力
能、会
请求、许可
可以
能力
不能、不会
情态动词 含义及用法 例句
must 表示主观看法，意为________ We must keep them in our lockers.
mustn't must的否定形式，意为________ You mustn't pick flowers in the garden.
have to 表示客观必要，意为________，其三单形式为________ She has to study for a test.
LAW
1. Don’t jump the queue. You ______________ wait your turn.
2. I _____ feed my dog many kinds of food, but I ______ give him chocolate. It is bad for him!
3. A: Can I leave the classroom if I don’t feel well
B: Yes, but you _______________ tell your teacher about it when you ______ be absent from class.
Complete the sentences using can, have to / must, or can’t / mustn’t.
3b
cut in line 插队
排队等待
feed my dog 喂狗
离开
be absent from 缺席
对......没有好处
LAW
4. A: Hey! Can I look at your book
B: Shh, we _________________ talk quietly in the library.
5. A: Can you put on your seat belt We _____________wear one when we are in a car.
B: Sure.Thanks!
Complete the sentences using can, have to / must, or can’t / mustn’t.
3b
小声说话
安全带
系上
put on the seat belt
3b
have to/must
can
can't/mustn't
can
have to
must/ have to
must/ have to
In the dinning hall
We can’t jump the queue.
We can’t waste food.
We have to clean the table before we leave.
我们不能插队
不能浪费食物
What rules do we have in the dinning hall
离开前清理桌子
In the library
We must keep quiet.
We mustn’t make noise.
We can’t eat here.
We can’t take books out of the library without permission.
What rules do we have in the library
保持安静。
禁止制造噪音。
不能在图书馆吃东西。
不能没有允许就把书拿出去。
Homework:
You must do:
Review the usage of imperatives and modal verbs in the lesson.
You can choose to do:
1.Write five cool rules for your dream school.
2. Finish exercise 1d.

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