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What rules do we follow
What rules do we follow
Unit 2 No Rules,No Order
Unit 2 No Rules,No Order
Section A (3a-3d)
通过观察及小组讨论，总结祈使句的用法和句型结构。
通过阅读例句，掌握情态动词的用法，并能却分have to与must的异同。
通过练习，能用不同的结构表达规则，并理解和遵守公众场合的规则。
03
Learning aims
02
01
Pay attention to the red sentences.
Don't need too much talking without saying anything
All I need is someone who makes me wanna sing
Take me to your heart
Take me to your soul
Give me your hand before I'm old
Show me what love is haven't got a clue
Show me that wonders can be true
They say nothing lasts forever
What kind of sentences a re they
Imperatives
祈使句
Stop talking.
Be quiet, please.
Come on!/ Hurry up!
Watch your head.
Keep off the grass.
命令(command)
No smoking.
请求(request)
劝告(advice)
禁止(prohibition)
警告(warning)
禁止(prohibition)
What is the imperatives for
表达命令(commands),请求(requests),劝告(advice),警告(warnings),禁止(prohibitions)等的句子
省略主语you
动词原形开头
Wash your hands.
Be quiet, please.
Watch your head.
Keep off the grass.
Be polite to your friends.
祈使句：以动词原形开头，省略主语you，用于表达
命令(commands), 请求(requests),劝告(advice),
警告(warnings),禁止(prohibitions) 等的句子。
Read more sentences and find out the feature of the sentences
Close the door.
Give me a break.
Take a seat.
Go away.
Keep off the grass.
Read more sentences and find out the structure of imperatives
Don't eat in the classroom.
Don't speak so loudly.
Don't touch that button.
Don't run in the hallways
Don't litter.
Do型祈使句
Do sth+其他.
Don't do sth+其他.
肯定句：
否定句：
Read more sentences and find out the structure of imperatives
Be quiet for a moment.
Be kind to our sister.
Be careful with the knife.
Be on time tomorrow.
Be a good boy.
Don't be late for school.
Don't be rude to others.
Don't be too shy.
Don't be too proud.
Don't be afraid to ask for help.
Be型祈使句
Be+adj.+其他.
Don't be+adj.
+其他.
肯定句：
否定句：
Let's go out and play.
Let's run to the police
station on fourth street.
Let her do it by herself.
Let me try again.
Let Tom go there himself.
Let's not say anything about it.
Let's not go out and play.
Don't let him go.
Let him not go.
Let's not eat too much sugar.
Read more sentences and find out the structure of imperatives
肯定句：
Let型祈使句
否定句：
Let sb do sth.
Let sb not do sth.
No taking photos!
No smoking!
No parking!
No fishing!
No littering!
No photos!
No pets allowed.
No food in the classroom.
No shoes on the bed.
Read more sentences and find out the structure of imperatives
No型祈使句
No+doing sth.
No +n.+其他
Imperatives
祈使句
肯
否
肯
否
肯
否
否
Do型祈使句
Be型祈使句
Let型祈使句
No型祈使句
1
2
3
4
动词原形(+宾语)+其他.
Don’t+动词原形(+宾语)+其他.
Be+表语(名词/形容词)+其他.
Don’t+be+表语(名词/形容词)+其他.
Let+宾语+动词原形+其他.
Don’t let+宾语+动词原形+其他.
Let+宾语+not+动词原形+其他.
No+动词-ing形式.
No+名词.
Summary
Walk in the hallway. Don’t run!
Be polite and treat one another with respect. Don’t litter.
Read the folloing sentences and tick which kind of sentences are they
3a
Read the sentences. Do the verbs in bold need to change forms Why
We must keep them in our lockers. You mustn’t litter.
We can bring bottles class we can’t eat in class.
We have to eat in the dining hall. They don’t have to turn them off.
He has to do his homework on time. He doesn’t have to get up early on weekends.
3a
Modal verbs
情态动词
情态动词有一定的意义,但不能单独作谓语,一般和实义动词连用构成谓语.
情态动词是动词的一种,表示说话人的语气和态度等.
can
can’t
must
mustn’t
have to
may
will
should
注意:
1. -Can I eat in the classroom
-No, you can’t. But you can eat in the dining hall.
can
can’t
2. We can’t feed animals in the zoo.
3. You can go home now.
可以;能
不可以;不能
可以;能
不可以;不能
可以;能
1
can表示请求或许可,意为 “可以;能”,否定形式can’t意为 “不可以;不能”.
-Can you play the piano
-No, I can’t. But I can play the guitar.
can
can’t
能;会
不能;不会
能;会
2
can表示能力,意为 “能;会”,否定形式can’t意为 “不能;不会”
1. -Can it be true
-No, it can’t be true.
can
can’t
2. Tom can’t be at home.
可能
不可能
不可能
3
can表示推测,意为 “可能”,否定形式can’t意为 “不可能”.(常用于否定句或疑问句)
can
can’t
3
can表示推测,意为 “可能”,否定形式can’t意为 “不可能”.(常用于否定句或疑问句)
Summary
2
can表示能力,意为 “能;会”,否定形式can’t意为 “不能;不会”
can表示请求或许可,意为 “可以;能”,否定形式can’t意为 “不可以;不能”.
1
Read more sentences and find out the structure of the sentences
You must finish it today. I have to tidy my room.
She has to help with the washing.
You mustn't phone him this evening. You don't have to go hiking.
He doesn't have to stay at home all day.
-Must I go there today -Yes, you must. -No, you needn't. -Do you have to look after your sister
-Yes, I do./No,I don’t.
-Does Jim have to do his homework
-Yes, he does./No,he doesn’t.
肯定句：
sb must do sth.
must
否定句：
sb musn't do sth.
一般疑问句：
Must sb do sth？
Yes, sb must.
No,sb needn’t.
肯定句：
sb have/has to do sth.
否定句：
sb don’t/doesn’t have to do sth.
一般疑问句：
Do/does sb have to do sth？
Yes, sb does.
No, sb doesn’t.
have to
表达意义
人称,数和时态
否定形式
1
2
3
have to
Summary
must
have to
&
must
侧重于客观需要,含有 “不得不”的意思
侧重于说话者的主观意愿,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”
Complete the sentences using can, have to / must, can’t / mustn't.
1. Don’t jump the queue. You _____________ wait for 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 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!
have to / must
can
can’t / mustn’t
have to / must
have to
have to / must
have to / must
3b
Do you see these sings
where can you see them
Can you tell the meaning of them
3c
Do not eat or drink.
No eating or drinking.
You can’t / mustn’t eat or drink.
Look at the first sign and read the rules. Then write the rules for the other signs.
in the classroom
in the library
in the museum
Do not park here.
No parking.
You can’t / mustn’t park here.
on sidewalks
at bus stops
in crosswalks
Do not take photos.
No photos.
You can’t / mustn’t take photos.
in the museum
in a cinema
temple halls
by the river/lake
areas with dangerous marine life
Do not swim.
No swimming.
You can’t / mustn’t swim.
Do not feed the birds.
No feeding.
You can’t / mustn’t feed the birds.
in the zoo
nature reserves
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
Homework
(Must do) List more RULES of these places: library, school dining hall, park, cinema and hospital by using can/can’t, must/mustn’t, have to.
(Try to do) Think about this question: What do you think of rules

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