Unit 4 Don't eat in class(1) 语法 祈使句 课件（16张PPT）

(共16张PPT)
七年级英语-下册-Unit4 Don't eat in class.
课题：Unit4 Don't eat in class.
难点名称：能够正确使用祈使句发布命令、制定规则
*
CONTENTS
What can we do at school
What can’t we do at school
Lead-in
school rules
At school
Do you know them？
Daily Life
Read and think（思考）
Stand up!
Listen to me carefully.
Turn to Page 21.
Sit down, please!
Please open the door.
Don't be late for class.
Don't eat in the classroom.
Don't fight.
Don't sleep in class.
Don't talk in class.
positive
negative
祈使句是英语的基本句型之一，表达说话人对对方的叮嘱、劝告、请求或命令等，往往有表示请求、命令、希望、禁止、劝告等意思。
祈使句一般没有主语，实际上是省略了主语“You”。句末用感叹号或句号，用降调朗读。
1.Definition:
Imperative Sentence
Presentation
2.Features
You can not arrive late for class again.
You can sit down, please.
2.谓语动词一律用原形。
1.主语通常为you,但常省略。
3.句末根据语气的强弱用感叹号或句号。
Don't arrive late for class again.
Sit down, please!
3.Positive肯定祈使句
祈使句的肯定句式有三种形式，即
1). Do型( 以行为动词原形开头)
例如: Sit down 坐下!
2). Be型(以be开头),
例如: Be quiet保持安静！
3). Let型（以let开头）
例如: Let me do the thing. 让我来做这件事。
Attention：
有时可在祈使句的句首或句尾加上please，使语气显得客气、有礼貌。如果在句尾加please，应该用逗号与前句隔开。
e.g. Help me, please. 请帮助我。
Please help me.
4.Negative 否定祈使句
(1). Do型和Be型的否定式是在句首加don’t。
e.g. Don’t sit here. 不要坐在这儿。
Don’t be late for school. 别上学迟到。
(2). 以let开头的祈使句，其否定式有两种：
一种是直接在句首加don’t，
另一种是“let + 宾语 + not +动词原形+ (其他)”。
e.g. Don’t let him do that thing. 不要让他做那件事。
Let’s not go there. 我们不要去那儿。
(3)“No+名词/动词-ing形式”表示禁止或规劝，常用于公共场所。
e.g. No photos! 禁止拍照！
No swimming！ 禁止游泳！
1. Jim, _____ me three yuan.
A. gives B. is giving C. give D. will give
2. _______ me do it for you.
A. Lets B. Letted C. Let D. Letting
3. Let's ____ the clean water.
A. not waste B. no wasting C. not to waste D. no waste
4. _____ forget to write to me when you
get home on time.
A. Don't B. Doesn't
C. 不填 D. Didn't
Choose the correct answers.
Exercises
5. Please ___ do it right now.
A. he B. he let C. let him D. lets him
6. _____ let anyone use my phone.
A. Don't B. Will C. Not D. No
7. ____ me one yuan , and I will give you a small gift.
A. Gave B. Gaving C. To give D. Give
8.____ late for school again, or you will be punished（惩罚）.
A. Don’t be B. You aren’t
C. Can’t be D. Aren’t
Usage of Imperative Sentence
主语是you常省去，动词原形开头记。
否定形式要注意，句首要把don’t加。
要讲客气用please， 句首、句末没关系。
Summary
Thank you!