Unit 4 Don't eat in class祈使句的用法课件13张

(共13张PPT)
人教版初中英语七年级下册第四单元
《Don't eat in class》
-祈使句的用法
目录
CONTENTS
Lead–in
Presentation
Exercise
Summary
Imperative sentence
一、Lead–in:
1.Listen to a song.
Touch your eyes,please.
Touch your nose,please.
Touch your mouth,please.
Touch your ears,please.
Stand up,please.
Sit down,please.
一、Lead–in:
2.Imperative sentence
eg:
Go and wash your hands.
Be quiet,please.(Please be quiet.)
Be kind to our sisters.
Watch your steps.
Don`t arrive late for class
Keep off the grass.
No fishing.
定义：用于表达命令、请求、劝告、警告、禁止等句子叫做祈使句，通常说话的对象是第二人称you。主语you一般省略。
二、祈使句的常见结构
1)肯定式： 动词原形+其它成分
2)否定式： Don't +动词原形+ 其它成分
eg:
Close the window.
Open your books.
eg:
You can`t eat in class!
=Don't eat in class!
You can`t talk in class!
=Don't talk in class!
1.大哥 V
二、祈使句的常见结构
please +动词短语
（please也可放在句尾，其前面加逗号）
3.三哥 P
eg:
Please sit down.
相当于Sit down,please.
2.二哥 B
1)肯定式： Be+其它成分
eg:
Be a good boy!
Be quiet！
2)否定式： Don't be+ 其它成分
eg:
Don't be noisy
Don't be late for school.
二、祈使句的常见结构之
合作探究
★ 1)肯定式：Let + 人称代词宾格 + 动词原形 + 其它成分
eg：
Let's have a rest!
Let's go to school!
eg：
Let us not draw on the desk.
Let the boy not push the door.
★ 2)否定式：Let + 人称代词宾格 + not + 动词原形 + 其它成分
1
★有时，为了加强语气，可以在动词之前加do。
2
3
★ No+名词/动名词 表示禁止，含否定含义，经常用于公共场所。
eg:
Do sit down.
Do study hard.
eg:
No smoking!
No photos！
二、祈使句的常见结构之
合作探究
1.Guessing Game
三、学以致用
Don't eat！
Turn left！
No parking！
Turn right！
三、学以致用
2.Group work
Wear a mask. (Do wear a mask.)
Wash your hands frequently.
Cover nose and mouth.
Let fresh air in.
Go out less.
Don't gather.
Sit down.
Come in.
Eat at home.
Listen to music outside.
Do your homework at school.
Don't sit down.
Don't come in.
Don't eat at home.
Don't listen to music outside.
Don't do your homework at school.
3.唱反调Let's write
Change the following imperative sentences into negative ones.
三、学以致用
Summary
祈使句，无主语，只用谓语就可以。
表示请求或命令，加上please表客气。
Stand up, please! 请起立!
Come here.来这里。
如果变成否定句，Don't 开头是规律。
No fishing!是警示语，祈使句用法要牢记!
四、小结
Thank you for watching