资源简介

(共27张PPT)
R·七年级下册
Unit 2 No Rules, No Order
(Section A Grammar Focus 3a-3d)
Grammar focus
3a Read the sentence. Circle the word that introduces a reason.
Walk in the hallway. Don't run!
Be polite and treat one another with respect. Don't litter. / You musn’t litter. /You can’t litter.
Can we bring our phones to class No, we can’t. We must keep them in the lockers.
Can we eat snacks in class No, we can’t eat in class. We have to eat in the dining hall.
1.祈使句的概念
(1)祈使句一般用来表示请求、命令、劝告、警告、禁止等。祈使句的主语一般是第二人称you，但往往省略。祈使句的肯定式以动词原形开头，否定式在动词原形前加don’t。句末用句号或感叹号，读时用降调。为表示礼貌，祈使句经常在句首或句末加上please。当please在句末时，其前通常加逗号。
祈使句
Grammar Focus
Read and judge(读句子，并判断).
（ ）
（ ）
（ ）
（ ）
Please give me some water.
Go out!
Make good use of your free time, please.
Please don’t run in the hallways.
表请求
表命令
表劝告
表警告
Walk in the hallways. Don’t run!
Be polite and treat one another with respect. Don’t litter.
祈使句的肯定句和否定句是怎样构成的？
Read and think
Do 型 肯定句： 动词原形(+其他). 去刷牙！
否定句： Don’t+动词原形(+其他). 不要乱扔
（垃圾）。
Go and brush
your teeth!
Don’t litter.
2.祈使句的句式
Be 型 肯定句： Be+表语(+其他). 请安静。
否定句： Don’t+be+表语(+其他). 不要吵闹。
Be quiet, please.
Don’t be noisy.
Let 型 肯定句： Let+宾语+动词原形 (+其他). 让我帮你吧。
否定句： ①Don’t let+宾语+动词原形(+其他). ②Let+宾语+not+动词原形(+其他). 别让他走。
Let me help you.
Don’t let him go./
Let him not go.
其他 No+动词-ing形式/名词. 禁止游泳。
禁止拍照。
表示强调时，可在动词原形前加do，意为 “一定，务必”。
一定要来看我。
No swimming.
No photos.
Do come to see me.
注意
为表示礼貌，可在祈使句的句首或句末加上please。当 please在句末时，要用逗号与句子其他部分隔开。
请遵守校规。
注意
Please follow the school rules.
＝Follow the school rules, please.
You mustn’t litter.
/You can’t litter.
Can we bring our phones to class No, we can’t. We must keep them in our lockers.
Can we eat snacks in class No, we can’t eat in class. We have to eat in the dining hall.
观察它们在用法上有什么共同点？2.can/must/have to后面接动词的什么形式？
3.have to在句法上和其他情态动词的区别在哪里？
can/must/have to +动词原形
have to 与其他情态动词不同，有人称、数和时态的变化
表示主观的义务或必要，无人称、数和时态 的变化，意为“必须”。
我必须做作业。
I must do my homework.
情态动词must
(2)表示肯定推测，常用于肯定句中，意为“一定、必然”。这个故事一定很有趣。
The story must be funny.
2.情态动词have to
1) have to 意为“必须；不得不”，后接动词原形，表示客观需要做的事情。例：现在我不得不离开。
I have to leave now.
2)have to 有人称、数和时态的变化，其第三人称单数形式为 has to。过去式为 had to 。
辛迪每天必须铺床。
Cindy has to make the bed every day.
You don’t have to arrive there at eight.
have to/must
can’t/musn’t
have to/must
must / have to
have to/must
have to/must
have to/must
wait your turn
等待轮到你
v. 离开；留下
缺席，不在
adv. 轻声地；安静地
安全带
穿上，戴上
3b Complete the sentences using can, have to /must, or can't/mustn't.
1. Don't jump the queue. You _____________wait for your turn.
2. You _________________ just ask your teacher a question in class. You
______________ raise your hand first.
3. A: Can I leave the class if I don't feel well
B: Yes, but you ______________tell your teacher about it when you
_______________ be absent from class.
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're in a car.
B: Sure.Thanks!
●Do not eat or drink.
●No eating or drinking.
●You can’t /mustn’t eat or drink.
3c Look at the first sign and read the rules, Then write the rules for the other signs.
Do not park. No parking. You can't / mustn't park.
Do not take photos / pictures. No photos / pictures. You can't / mustn't take photos / pictures.
Do not swim. No swimming. You can't / mustn't swim.
Do not feed the birds. No feeding the birds.
You can't /mustn't feed the birds.
v. 喂养；饲养
3d In groups, brainstorm three rules for one of the places below. Then draw signs to show the rules. Share your signs in class and explain what they mean.
library school dining hall park cinema hospital
In the library, we must keep quiet. We mustn’t make noise.
We can’t ...
保持安静 制造噪音
头脑风暴
In the library
We must keep quiet.
We mustn’t make noise.
We can’t eat or drink here.
We can’t take books out of the library without permission.
In the school dinning hall
We can’t jump the queue.
We can’t waste food.
We have to clean the table before we leave.
In the park
We can’t throw rubbish here and there.
We can’t walk on the grass and pick flowers.
We can’t play with fire.
In the cinema
We must sit on the assigned seat shown on the ticket.
We mustn’t smoke here.
We must keep quiet while watching.
In the hospital
We mustn’t smoke.
We have to be quiet.
Don’t run in the hallways.
Rules are everywhere in our daily life. We should follow the rules and make a quiet and comfortable place for everyone.
Checklist Be able to use imperatives ☆☆☆
Be able to use the modal verbs must/can/have to ☆☆☆
Be able to read and tell rules in your daily life. ☆☆☆
Self-assessment
单词 rule, order, follow, arrive, uniform, hallway, litter, polite, treat, respect, if, jacket, late for, on time, have to, follow rules, be polite
句型 -Can+ 人 肯定回答-Yes, he/she can.
Rules: 否定：No, he/she can’t. He/She has to .
Don’ t be late for school. Arrive on time.
Don’ t run in the hallways.
Don’ t eat in the class.
Wear the school uniform.
Don’ t use your phone in class.
Don’ t litter. Keep your school clean and tidy.
Be polite and treat everyone with respect.
Put up your hand if you want to ask your teacher a question.
Thank you!

展开更多......

收起↑