Unit 4 Don't eat in class SectionA(GrammarFocus-3c)课件 (共12张PPT)

(共12张PPT)
Don’t eat in class.
SectionA GF-3C
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
2祈使句的否定句怎么样构成的？肯定句呢？一般什么情况下使用祈使句？
1圈出情态动词，情态动词在用法上有什么共同点？
3can在本单元主要表示什么含义？它还可以表达什么意思？
4have to在句法上与其他的情态动词的区别
Language points
1.情态动词
1.can
①表示能力：“会，能；请求许可”
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
-- Can the students run in the hallways
-- Yes, they can./No, they can’t.
2.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：I must study hard.
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 get to school on time.
如：You mustn't drive very fast near the school.
have to的句型结构:
肯定句：
主语＋have/has/had to＋V原形＋其他.
否定句：
主语+don’t/doesn’t/didn’t have to＋V原形＋其他.
疑问句:
Do/Does/Did＋主语＋have to＋V原形＋其他
e.g. She has to look after her mother at home.
We don’t have to clean the room today.
--Does he have to go to bed now
--Yes, he does./ No, he doesn’t .
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.
----- Must I hand in my homework today
---- No, you don’t have to/ you need’t.
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.
1.祈使句是表示命令、叮嘱、号召等的句子;
2.通常省略主语you;
3.Do/Don't + 动词原形;
4.祈使句有肯定和否定两种：
Don’t eat in class.
Come in, please! 请进！
Take a sit, please. 请坐。 　
Don’t run around in the classroom.
Don’t fight.
否定
肯定
2.祈使句
1. 不要在楼道里跑。 _______________________________
2. 不要打架。 ________________________________
3. 有什么规则？ ________________________________
4. 我们必须按时上课. ______________________________
5. 我们可以在教室里吃东西吗？
__________________________________________________
6. 不能。但我们可以在餐厅里吃东西。
_________________________________________________
阅读Grammar Focus部分，完成下列句子。
Don’t fight.
Don’t run in the hallways.
What are the rules
We must be on time for class.
Grammar Focus
Can we eat in the classroom
No, we can’t, but we can eat in the dining hall.
改疑问句
及回答
Must we be on time for class
Yes, you must.
No, you needn’t/don’t have to.
7. 我们可以在上课的时候带帽子吗？
___________________________
8. 他在学校里必须穿校服吗？
__________________________________
9. 是的，必须。/ 不，不必。
_______________________________
10. 你们必须做什么？
_______________________________
11. 在图书馆里我们必须保持安静。
_________________________________
Yes, he does. / No, he doesn’t.
Does he have to wear a uniform at school
What do you have to do
We have to be quiet in the library.
Can we wear a hat in class
改为陈述句
改疑问句并回答
He has to wear a
uniform at school.
Do we have to be
quiet in the library
Library Rules
Don’t talk.
__________________
__________________
__________________
___________________
Write the rules for the school library.
Don’t listen to music.
Don’t eat or drink.
Don’t take photos.
Don’t smoke.
3a
②
①
③
④
⑤
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。
Be quiet
1. Does she have to be quiet in the library
(she / have to / in the library)
2. Eat (he/have to/in the dining hall)
Q: ____________________________________
A: _____________
3. Listen to music (we/can/in the hallways)
Q: ____________________________________
A: _____________
4. Wear a hat (we/can/in the classroom)
Q: __________________________________
A: _______________
Yes, he does.
Does he have to eat in the dining hall
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
Use the words to make questions about the rules.
Then write answers according to your school.
Tip：
观察疑问句，谓语是用助动词还是情态动词？
Make up five cool rules for your dream school. Share your rules with the class. Your classmates vote（投票） for the Coolest School!
3c
Report
At my dream school, we don’t have to come to school every day.
We don’t have to arrive at school so early. We can be late for class.
We can bring mobile phones or music players to school.
We can listen to music in class and we can eat or drink in class.
We don’t have to do too much homework every day.
We can play computer games for half an hour after school.
We don’t have to wear school uniforms. We can wear a hat in class.
At my dream school, we don’t have to come to school every day. We …
We can eat in class. …
1. He has to eat breakfast quickly. (改为一般疑问句)
__________________________________
2. Play volleyball after class. (改为否定句)
________________________________
3. We can wear sports shoes in class. (改为一般疑问) ______________________________
4. Don’t arrive late for class. (改为同义句)
_______________________________
5. Eric has to do his homework before six. (对划线部分提 ___________________________________
句型转换
Does he have to eat breakfast quickly
Don’t play volleyball after class.
Can we wear sports shoes in class
We must be on time for class.
What does Eric have to do before six