人教版七年级下册Unit 4 Don't eat in class. Section A 2d-Grammar课件(共20张PPT，无音频)

(共20张PPT)
Section A 2d-Grammar
Don’t eat in class
Unit 4
Revision
Don't be late.
We must be on time.
We have to be on time.
We can’t be late.
Revision
Don't fight.
We can’t fight with our classmates.
We must be good with our classmates.
Revision
Can we ... ...
Read the conversation and fill in the chart.
DOs DONs
be late for class
bring music players to school
be on time
wear the school uniform
be quiet in the library
2d
Listen and then read aloud
2d
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.
祈使句一般用来表示请求、命令、劝说、号召、警告等。在祈使句中，通常省略主语you，其肯定形式以动词原形开头，否定形式是在动词原形前加don’t。祈使句句尾用句号或感叹号，读时用降调。为表示礼貌，可以在句首或句尾加上please。句末用please时，前面通常加逗号。
祈使句
Language points
祈使句的形式
(1)let开头的祈使句的肯定句：Let + sb.+ v.（原形）
例: 让我们帮助你。
Don’t let them come in.
Let us help you.
否定为：Don’t + let + 第三人称代词+v.（原形）
例: 不要让他们进来。
Language points
(2)非let开头的祈使句的肯定句和否定句：
肯定句
Do 型
Be 型
动词原形（+宾语）+其他成份.
Be+表语(名词或形容词）+其他成份.
例：Listen to me, please.
例：Be quiet, please.
请听我说。
请安静。
Language points
否定句
Don’t +行为动词 +其他.
Don’t + be +其他.
No + n./v.-ing.
例: Don’t play computer games.
例: Don’t be late again.
例: No photos.
No swimming.
不要玩电脑游戏。
不要再迟到。
不许拍照。
不许游泳。
Language points
Language points
情态动词
can
1. 表示能力：“会，可以，能，能够”
2. 不能单独作谓语，后必须接动词原形一起构成谓语
3. 没有人称的数的变化
4. 否定形式加not: can not,cannot, 或缩写can't疑问句can 提前。
例： I can't play the gutar.
Can we eat in the classroom
Language points
情态动词
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”必须”，还用来表示命令和愿望。
如：You must stop at the red light.
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。
如：You have to add some water into the flour.
Language points
情态动词
情态动词must与have to
在回答must引起的问句时，如果是否定的答复，可用don’t have to或needn’t (不必) , 但不能用mustn’t (一定不, 必须不, 不允许, 不得)
如：You mustn't drive very fast near the school.
have to的否定形式为not have to，相当于needn’t，意为“不必”
如：She doesn't need to clean it now.
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.
Tips
1. 由图示可知都是一些禁止类的祈使句。
2. 可知应用“Don’t + 动词原形”句子。
3b
Use the words to make questions about the rules. Then write answers according to your school.
Q:____________________________________(she/have to/in
the library)
A: ____________________________________.
Be quiet
Does she have to be quiet in the library
Yes, she does
Tips
1. 观察疑问句，提出助动词、情态动词。
2. 第二位提出主语+动词，剩下按常规写完。
Eat
Q:___________________________________ (he/have to/in
the dining hall)
A:___________________________________
Does he have to eat in the dinning hall
Yes, he does.
Q:___________________________________(we/can/in the
hallways)
A:___________________________________
Listen to music
Can we listen to music in the hallways
No, we can’t.
Wear a hat
Q:___________________________________(we/can/in the
classroom)
A:___________________________________
Can we wear a hat in the classroom
No, we can’t.
3c
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 …
At my dream school, we don’t have to come to school every day. We can eat in class. We …