祈使句
Imperative Sentence
表示请求、命令、劝告、祝愿或建议的句子。
祈使句
Open the door.(命令)
Be quiet, please.(请求)
Be kind to your friends.(劝告)
Look out! Danger! (警告)
No parking！(禁止)
巧记祈使句
祈使句无主语，主语you常省去；
动词原形谓语当，句首加don't或no变否定；
朗读应当用降调，句末常标感叹号或句号；
要讲客气用please，句首句末没关系。
肯定祈使句
(1)系动词be开头的祈使句
Be动词+其他(形容词、名词或介词短语等)
Be quiet!
Be a good student!
Be careful when crossing the street.
(2)实义动词开头的祈使句
行为动词原形+其他
Come in, please!
Stand up, please.
Please stand up.
(3)Let句型
Let' s/ Let us+动词原形；或者是Let+宾语+其他。
Let’s play basketball!
Let me help you.
否定祈使句
(1)Don't+动词原形
Don't be careless.
Don' t be late again.
Don't look at your books.
(2)Let引起的祈使句的否定形式
a.Let's(Let sb. )+not+动词原形
Let's not say anything about it.
Let them not play with fire.
b. Don' t+ let+宾语+动词原形+其他
Don' t let Jim do that.
Don' t let us go, please.
(3)在公共场合的提示语中，否定祈使句常用“No+名词/V-ing形式”结构，表示“禁止做某事”
NO smoking!
No parking!
祈使句的反义疑问句
(1)陈述部分为祈使句疑问部分通常用will you/won't you。
Pass me the book, will you?
(2)陈述部分为祈使句否定形式，疑问部分只能用will you 。
Don't forget to do your homework, will you?
(3)陈述部分是Let's...时，表建议，疑问部分用shall we 。
Let's go shopping, shall we?
(4)陈述部分是Let us...时，表建议，疑问部分用shall we。表请求，疑问部分用will you。
Let us go shopping together, shall we?
Let us clean the room for you, will you?
