资源简介

(共39张PPT)
Unit 2 No Rules, No Order
(Section A Grammar Focus 3a-3d)
第3课时
R·七年级下册
Revision
Read and complete with the right forms.
Mrs. Brown
_____(Walk) in the hallway. Don’t _____(run)!
Don’t ______(litter).
_____(be) polite and _____(treat) everyone with respect.
What rules does Mrs. Brown inform(告知) students
Walk
You mustn’t ______(wear) other clothes to school instead.
run
wear
litter
Be
treat
Can we ______(bring) our phones to class
No, we ______. We must _______(keep)
them in our lockers.
What rules are Tom and Anne talking about
bring
can’t
keep
Can we ______(eat) snacks in class
No, we can’t______(eat) in class. We have to ________(eat) in the dining hall.
eat
eat
eat
Read the sentences. Do the verbs in bold need to change forms Why
Walk in the hallway. Don’t run!
Be polite and treat one another with respect. Don’t litter./
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.
3a
Imperatives(祈使句)
The usage of modal verbs can/must/have to
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.
Can
Can
mustn’t
can’t
must
have to
can’t
Read and think
观察它们在用法上有什么共同点？
can/must/have to后面接动词的什么形式？
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
情态动词can
用法 例句
意为“可以；能”，
表示请求或许可
意为“能；会”，表示
能力
意为“可能”，表示推测，
常用于否定句或疑问句中
你能帮我吗？
她会拉小提琴。
他不可能在家。
Can you help me
She can play the violin.
He can’t be at home.
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
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.
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。
现在我不得不离开。
I have to leave now.
have to 有人称、数和时态的变化，其
第三人称单数形式为 has to。
辛迪每天必须铺床。
Cindy has to make the bed every day.
含有 have to 或 has to 的句子需分别借助助动词 do 或 does 构成疑问句或否定句。
她必须早起吗？
你不必8点钟到那儿。
Does she have to get up early
You don’t have to arrive there at eight.
In what situations(场景)
will we use imperatives or modal verbs to tell the rules List some examples(举例子).
Free talk
Don’t jump the queue. You ____________
wait your turn.
Complete the sentences using can, have to/must, or can’t/mustn’t.
3b
must/have to
wait your turn
等待轮到你
queue n. 队
jump the queue 插队
I ____ feed my dog many kinds of food, but I ____________ give him chocolate. It is bad for him!
can
can’t/mustn’t
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.
must
v. 离开；留下
absent adj. 缺席的；不在的absent from 缺席；不在
have to
A: Hey! Can I look at your book
B: Shh, we ___________ talk quietly in the
library.
must/have to
interj. 嘘（用以让别人安静下来）
adv. 轻声地；安静地
A: Can you put on your seat belt We _____________ wear one when we’re in a car.
B: Sure. Thanks!
must/have to
n. 安全带；腰带；皮带
穿上 ；戴上
Look at the first sign and read the rules. Then write the rules for the other signs.
3c
Do not eat or drink.
No eating or drinking.
You can’t/mustn’t eat or drink.
Read and write
Do not park the car.
No parking.
You can’t/mustn’t park.
Do not take photos.
No photos.
You can’t/mustn’t take photos.
Do not feed animals.
No feeding.
You can’t/mustn’t feed animals.
v. 喂养；饲养
Do not swim.
No swimming.
You can’t/mustn’t swim.
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.
3d
头脑风暴
library school dining hall park cinema hospital
In the library, we must keep quiet. We mustn’t make noise. We can’t ...
n. 声音；噪音
制造噪音
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
Summary
Grammar
Imperatives
Modal verbs: must/can/have to
Show rules
Do not…
No…
You can’t/mustn’t…
Review the usage of imperatives and modal verbs in the lesson.
Read and show more rules in different places in your daily life.
Homework

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