资源简介

(共24张PPT)
Unit 2 No Rules, No Order
（语法课）
Section A (Grammar Focus）
Learning Objectives
In this lesson, we will be able to:
1. understand the rules of using imperatives and modal
verbs can, have to and must;
2. make rules for a certain place.
I say
You say
“Don’t”
“litter!”
I say
You say
“No”
“running!”
I say
You say
“Be”
“polite!”
I say
You say
“Let's”
“go!”
I say
You say
“Keep”
“clean!”
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。
祈使句句尾用句号或感叹号。
Imperative Sentences
3. 祈使句的类型？
肯定式
Wear the uniform!
Put up your hand!
Do型：动词原形+其他
Be polite, please!
Be careful!
Be型：Be+其他
Let’s go to the classroom!
Let’s have lunch!
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 eat here!
Don’t let him go!
Don’t型 Don’t be+其他
Don’t v原+其他
Don’t let+其他
No photos!
No running!
No型 No+n.
No+v.ing
通常表示“禁止……”，用于指示牌、布告等
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。
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
can’t = can not
mustn’t = must not
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
3
情态动词不能单独作谓语，必须和系动词或实义动词连用
特点
情态动词
Modal Verbs
在 祈使句中 和 情态动词后，动词均用原形。
Modal Verbs
情态动词
1. We must respect the elderly.
2. We have to wear uniforms at school.
must
表达说话者主观的看法、信念或强烈的建议，常用于表达个人的决心、义务感或内在的驱动力。
have to
强调由于外部的客观情况、规定、事实等因素，导致不得不做某事，并非完全出于个人意愿。
例句
Complete the sentences using can, have to / must, or can't / mustn't.
3b
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.
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
can
have to / must
have to / must
social rule社会
class rule
library rule
traffic rule交规
feeding rule
Look at the first sign and read the rules. Then write the rules for the other signs.
3c
Don’t park.
No parking.
You can’t / mustn’t park.
Don’t take photos.
No photos.
You can’t / mustn’t take photos.
Look at the first sign and read the rules. Then write the rules for the other signs.
3c
Don’t swim.
No swimming.
You can’t / mustn’t swim.
Don’t feed the birds.
No feeding.
You can’t / mustn’t feed the birds.
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.
cinema
library
hospital
park
school dining hall
Then draw signs to show the rules. Share your signs in class and explain what they mean.
3d
In groups, brainstorm three rules for one of the places below.
3d
library school dining hall park cinema hospital
In the library, we must keep quiet.
We mustn’t make noise.
We can’t bring food to the library.
We can’t talk loudly in the library.
…
Sample
library rules
In the library, we must keep quiet first. We mustn’t make noise.
Second, we can’t bring any food or drink to the library. We must keep it clean and tidy.
What’s more, we have to return the books after we finish reading.
Let’s make the library a better place for us to study.
Thanks!

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