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(共19张PPT)

Unit 2
No Rules, No Order
Section A Grammar
What rules do we follow
Read and pay attention to the sentence patterns.
Tom
Ms Brown
Tom, do you know the school rules now
Yes, Ms Brown. I know many rules. For example, walk in the hallway.
Any other rules
Be polite and treat one another with respect.
Don’t run.
Don’t be rude.
No smoking.
Let’s follow the rules.
Walk in the hallway.
Be polite and treat one another with respect.
Don’t run.
Don’t be rude.
No smoking.
Let’s follow the rules.
Read and find the rules.
Why do we use imperatives(祈使句)
To give commands(命令）
To make requests(请求）
To give warnings(警告）
To give suggestions(建议）
肯定祈使句
否定祈使句
Let’s not break the rules.
Do型祈使句
Be型祈使句
Let型祈使句
其它型祈使句
Do型祈使句
起床
吃你的早餐
把那个给我
读这本书
不要吃那个蛋糕
不要碰它
不要着急
不要坐这儿
Be型祈使句
小心
Let型祈使句
Don’t be careless.
不要粗心
让我们出去吧
我们别出去了。
How can we make imperatives more polite
其它型祈使句
No parking.
No photos.
No swimming.
No feeding.
Never give up.
由never开头构成的否定祈使句。
Tom and Anne are talking about the traffic rules.
Anne, do you know some traffic rules
Yes. You can turn right when you see the sign.
You are right. Drivers can’t park here.
You mean drivers mustn’t park here.
Yes. We must look at both sides before crossing the road.
I agree. We also have to wear a seatbelt while taking a car.
Do you know the differences among can/have to/must
Anne, do you know some traffic rules
Yes. You can turn right when you see the sign.
You are right. Drivers can’t park here.
You mean drivers mustn’t park here.
Yes. We must look at both sides before crossing the road.
I agree. We also have to wear a seat belt while taking a car.
can
You can turn right when you see the sign.
Can we bring our phones to class
You can’t swim here.
I can translate the rules into English.
表许可，意为“可以”
表请求，意为“可以”
表许可，意为“可以”（否定）
表能力，意为“能；会”
must VS. have to
Drivers mustn’t park here.
We must look at both sides before crossing the road.
Must强调说话者的主观意愿，“必须”
无人称和数的变化，后接动词原形。
We have to wear a seat belt while taking a car.
She has to get up early to prepare breakfast.
She doesn’t have to get up early to prepare breakfast.
have to强调客观需要，“不得不”
有时态/人称/数的变化，
否定形式 don’t have to
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.
Pay attention!
You must look after your sister tomorrow.(同义句)
You have to look after your sister tomorrow.(同义句)
根据语境，must和have to可以转换同义句。
Summary
Do型祈使句
Be型祈使句
Let型祈使句
其它型祈使句
can/can’t
have to
must/mustn’t
Practice
/kju /
插队
must
have to
can
can’t
must
have to
have to
旷课；缺席课程
must
have to
系上你的安全带
must
have to
Practice
Don’t park.
No parking.
You mustn’t park here.
Don’t take photos.
No photos.
You mustn’t take photos.
You can’t take photos.
Practice
Don’t swim.
No swimming.
You mustn’t swim here.
You can’t swim here.
Don’t feed birds.
No feeding.
You mustn’t feed birds.
You can’t feed birds.
Practice
Where will you see these signs
Group work: BDS(brainstorm rules, draw signs and share the rules)
We must keep quiet.
We mustn’t make noise.
We have to return books on time.

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