Unit 4 Don't eat in class-祈使句(1) 课件（19张PPT）

(共19张PPT)
初中英语七年级下册Unit4
课题：祈使句
难点名称：用祈使句制定规则
Don’t eat
in class.
Don’t arrive
late for class
Don’t sleep
in class.
Don’t run in
the hallways.
Don’t talk in class.
Don’t play
soccer in the
classroom.
Don’t fight.
Don’t listen
to music in
the classroom.
school rules
Leading in
祈使句(Imperative Sentences)
1. 概念
(1)祈使句是指用来表示请求、命令、叮嘱、建议等的句子。祈使句没有主语，谓语动词用原形，句末使用感叹号或者句号。
(2)如果祈使句表示客气地请求，一般要加上please。但please加在句尾时，前面要用逗号隔开。
e.g. Please read after me.
= Read after me, please.
（请求）
知识讲解
一、祈使句的肯定式
1. 以行为动词原形开头，简称Do型。
e.g. Come here. 到这儿来。
2. 以动词be开头，简称Be型。
e.g. Be quiet, please. 请安静。
3. 以Let开头，简称Let型。
e.g. Let’s go! 咱们走吧!
肯定祈使句 否定祈使句
Sit down.
Come in.
Eat at home.
Listen to music outside.
Don’t sit down.
Don’t come in .
Don’t eat at home.
Don’t listen to music outside.
Language points:
二、祈使句的否定式
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. 别迟到。
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 go. 不要让他走。
Let’s not go there. 咱们别去那儿。
注意：
“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 smoking！ 禁止吸烟！
一、单项选择
1. _______ swim in the river alone，Karen. It's too dangerous.
A．Not　　　　B．Don't　　　　C．Doesn't
2. —What are the rules at your school
—Don't run in the hallways and _____ arrive late for class.
A．not to B．won't C．don't D．No
3. What bad weather it is! Let's _____ at home and watch TV.
A．stay B．staying C．stays D．stayed
4. —Mom, can I play computer games this evening
—____ your homework first, and then we’ll talk about it.
A. Finishing B. Finish C. To finish D. Finished
B
C
A
B
课堂练习
1. No photos. (改为同义句)
2. Play volleyball after class. (改为否定句)
Don't play volleyball after class.
3.You can't run in the hallways.(改为祈使句)
Don't run in the hallways.
Don't take photos.
二、按要求改写句子
Library Rules
Don’t talk.
________________
________________
________________
Write the rules for the school library.
Don’t listen to music.
Don’t eat or drink.
Don’t take photos.
方法指导：
1. 由图示可知都是一些禁止类的祈使句。
2. 可知应用“Don’t + 动词原形”句子。
Practice
_________ your hands frequently.
Wash
_________ the windows frequently.
Open
疫情下，我们该怎样做？
Practice
________ masks when you go out.
Wear
_______ at home and talk on the phone.
Stay
Practice
_________ when you don’t feel well.
See a doctor
_________ every day.
Exercise
Practice
_________ wild animals.
Don’t eat
_________ friends or relatives.
Don’t visit
Practice
_________ play cards.
Don’t
_________ the public places.
Don’t go to
Practice
_________ go out .
Don’t
_________ have a party .
Don’t
1.祈使句的概念
3.祈使句的否定式
2.祈使句的肯定式
4.用祈使句制定规则
Summary
Have a chant
Don’t arrive late for class.
Don’t run in the hallways.
Try to be a better student.
Don’t eat wild animals.
Don’t go to the public places.
Try to be a better citizen.(公民）