Unit 2 No Rules,No Order Section A Grammar 课件 人教版（新教材）七年级下册

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Unit 2
No rules, No order
Section A Grammar
Don't let them in,
Don't let them see
Be the good girl you always have to be
Conceal, don't feel,
Don't let them know
Well, now they know
Let it go, let it go
Can't hold it back anymore
Let it go, let it go
Turn away and slam the door
I don't care what they're going to say
Let the storm rage on
The cold never bothered me anyway
Watch and sing
Don't let them in,
Don't let them see
Don't let them know
Turn away and slam the door
Let it go, let it go
Let it go, let it go
Be the good girl you always have to be
What kind of sentences are they
Do型
Be型
Let型
Watch and think
祈使句 (Imperative sentences)
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.
Read the sentences. Do the verbs in bold need to change forms Why
3a
Imperative Sentences
1. 什么是祈使句？
祈使句一般用来表示命令、请求、劝说、号召、警告、禁止等。
Imperative Sentences
2. 祈使句的特点？
通常省略主语you
其肯定形式常以动词原形开头，否定形式是在动词原形前加don’t。
更礼貌，前面或后面加please
Imperative Sentences
3. 祈使句的类型？
肯定式
Turn back!
Go to bed now!
Do型：动词原形+其他
Be quiet, please!
Be careful!
Be型：Be+其他
Let’s go!
Let’s have a rest!
Let型：Let sb do+其他
Imperative Sentences
3. 祈使句的类型？
否定式
Don’t be late!
Don’t smoke here!
Don’t let him leave!
Don’t型 Don’t be+其他
Don’t do+其他
Don’t let+其他
No photos!
No smoking!
No型 No+n.
No+v.ing
Imperative Sentences
Summary
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。
Let’s practice
Don’t be
1. It’s an important meeting. (not, be) late.
2. (not, make) any noise! Your mother is sleeping.
3. (not, talk) and (read) aloud.
4. The notice on the wall says “ ”. (no smoke)
5. (look) out! A car is coming.
6. (not, let) the baby cry.
7. Let’s (not say) anything about it.
Don’t talk
Don’t make
read
No smoking
Look
Don’t let
not say
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.
Read the sentences. Do the verbs in bold need to change forms Why
3a
1
情态动词没有除了have to之外，其余没有人称和数的变化
2
情态动词后跟动词原形
特点
情态动词
Modal Verbs
情态动词用于表达说话人的态度、意愿、推测、建议、能力、义务等。
一、 情态动词can的用法
Can we bring our phones to class No,we can’t. We must keep them in our lockers.
can可表示能力、许可、请求等。其否定形式为can’t/cannot。
1.表示能力，意为“能，会”。
The twins can draw, but they can’t swim.
2.表示许可，意为“可以”。You can’t swim in the river.
3.表示请求，意为“可以”。
Can I borrow your eraser Yes, you can.
情态动词have to和must的用法
No,we can’t. We must keep them in our lockers. No,we can’t eat in class. We have to eat in the dining hall.
have to
①常强调客观需要,多译为“不得不”；
②有时态、人称和数的变化，其一般现在时的第三人称单数形式为has to，过去式为had to。have to的否定形式为don’t have to，表示“不必”。
must
①常表示说话人的主观看法，多译为“必须”；
②没有时态、人称和数的变化。must的否定形式为mustn’t，表示“禁止，不准”。
Pay attention!
Must I do the dishes now
Yes, you must.
No, you needn’t.
No, you don’t have to.
Must开头的一般疑问句
肯定回答用must
否定回答用needn’t 或don’t have to.
Presentation
Modal verbs情态动词
Read and summarize:
Look and learn
must
have to
表达意义
人称,数和时态
否定形式
1
2
3
have to
Summary
must
客观需要, “不得不”
说话者的主观意愿,认为有必要或者有义务去做某事
有人称,数和时态的变化,第三人称单数形式为has to
无人称,数和时态的变化
don’t/doesn’t have to “不必”
mustn’t禁止 “不要;不许”
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.
have to / must
can
have to / must
have to
can’t
3b
jump the queue 插队
wait your turn 等待你的顺序
feed my dog 喂狗
leave 离开
be bad for...对。。。有坏处
tell sb. about sth.告诉某人关于某事
tell sb. to do sth.告诉某人做某事
e.g. He tells me ____ (wait) my turn.
be absent from...缺席...
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!
have to/must
have to/must
look at看
put on 穿上、系上
talk quietly小声说话
seat belt安全带
wear 穿着，强调状态
put on穿上，强调动作
—Amy, ___________ talking now. We are having a class!
—Sorry, I won’t.
A. to stop B. stop C. stops D. stopping
2
Let Ken ________ you his new timetable.
A. show B. shows C. to show D. showing
3
—________ eat anything in class, Mike.
—Oh, I’m sorry.
A. Can’t B. Not C. Doesn’t D. Don’t
1
Multiple choice.
1. Let me _____ (tell) you about my family.
2. ___________ (not listen) to music in class.
3. Do you have to ______ (wear) school uniforms every day
4. You can’t eat in the classroom. You can _____ (eat) in the dining hall.
5. You must _____ (be) quiet in the library.
6. No ___________ (swim) in the river! It is too dangerous.
7. Boys and girls, please _____ (keep) the classroom tidy in school.
8. Everybody ________ (must, may) follow the traffic rules.
语法填空。
tell
Don’t listen
wear
eat
be
swimming
keep
must
1．— Must we sing a song at the party
— No, you ________.
A．mustn’t B．haven’t to C．not have to D．don’t have to
2．It’s snowing. Please ________ warm clothes.
A．wear B．wears C．wearing D．to wear
3．________ in bed. It’s bad for your eyes.
A．Not to read B．Don’t to read C．Don’t read D．Not read
4．It’s 7:15. Let’s ________ to school.
A．to go B．going C．go D.gone
D
A
C
C
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