Unit 4 Don't eat in class-祈使句课件9张

(共9张PPT)
祈 使 句
2020年玉林市中小学、幼儿园微课大赛
初中英语人教版 七下Unit4
What school rules do you have
Don't be late for class.
Don' t run in the hallways.
What school rules do you have
Don't eat in the classroom.
Don't listen to music in class.
祈使句（Imperative sentences）
用于表达命令、请求、劝告、警告、禁止等的句子叫做祈使句，祈使句最常用于表达命令。其主语一般是第二人称，但通常省略主语，谓语动词用原形，如：
* Be quiet,please.(Please be quiet.) (表请求 )
* Be kind to our little brother. (表劝告)
* Go and wash your clothes. (表命令)
* No smoking! (表禁止)
* Look out! Danger! (表警告)
肯定结构 (Positive forms)
1. Do型 (即:动词原形<+宾语>+其它成分)
Please have a seat here.=Have a seat here, please.
有的祈使句在意思明确的情况下,动词可省略。
如:This way, please. = Go this way, please.
2. Be型 (即:Be + 表语<名词或形容词>+其它成分)
Be a good girl!
3. Let型 (即:Let + 宾语 + 动词原形 + 其它成分)。
Let me help you.
否定结构 (Negative forms)
1. Do型和Be型的否定式都是在句首加don’t构成
Don't be late for school!
Don't run in the hallways!
2. Let型的否定式有两种:
① Don’t + let + 宾语 + 动词原形 + 其它成分
② Let + 宾语 + not + 动词原形 + 其它成分
Don’t let him go = Let him not go.
3. 有些可用No开头,用来表示禁止性的祈使句。
No + n / doing + 其他成分
No smoking! 禁止吸烟！ No parking!禁止停车！
Exercises:
一.单项选择.
1. Jim, _____ me a hand.
A. gives B. is giving C. will give D. give
2. ____ careful, Jenny! There is a tree in front of you.
A. Am B. / C. Be D. Was
3. Let's ____ our time.
A. not waste B. no wasting
C. not to waste D. no waste
4. —____ higher, and you will see the house.
—OK.
A. If you stand B. To stand
C. When you stand D. Stand
Exercises:
二、根据句意用括号内所给单词的适当形式填空。
1. （be）quiet in the library.
2. （not run）in the busy street.
3. （ remember）to bring your notebook.
4. Let's （play）soccer after school.
5. No （swim)!
Be
Don't run
Remember
play
swimming
Summary
Do型，即以行为动词原形开头
Please型，即以please开头
Be型，即以动词be开头
Let型，即以动词let开头
Don't+动词原形+其他
Don't+let+宾语+动词原形+其他
或Let+宾语+not+动词原形+其他
No+名词/动名词
Never+动词原形+其他
肯定结构
否定结构
祈使句