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1祈使句的定义及句式特征：定义：祈使句是用来表示请求、命令、叮嘱、邀请、劝告或祝愿等的句子。它的特点是通常省略主语you,以动词原形开头，末尾可用句号或感叹号。祈使句没有疑问句的形式，一般只有肯定和否定两种形式。
Go and wash your hands. (表命令)   
Be quite, please. （Please be quiet.）（表请求）
Be kind to your sister.（表劝告）  
Watch your steps.（表警告）
No parking. (表禁止)
2肯定形式（动词原形开头）1）以系动词be开头的祈使句，这种祈使句的常用结构：
be+形容词 / 名词
Be quiet / quick!          
Be a good student!
Be careful when crossing the street.
2）以实义动词开头的祈使句，这种祈使句的常用结构为：
动词原形+宾语（+其他）。
Come in, please！  
Please open your books！
Put them away!
3） let型（Let+宾语+动词原形+其他）
Let him do it by himself.    
Let me help you.
Let’s go to the park.
3否定形式（一般在动词上否定，也可以用否定副词来表示）1）be型（Don’t be +其他成分（形容词、名词或介词短语））
Don’t be careless!        
Never be late again next time!
注意：
①在这种句型中，be不能省略
②否定副词not不可置于be之后
2）do型（Don’t +动词原形+其他）
  Don’t believe him!   
Don’t worry!   
Never do it again!
3）Let引起的祈使句有两种否定形式  
a. Let+宾语+not+动词原形+其他
Let her not do that.
Let’s not think about it. It’s only a waste of time.
b. Don’t+ let+宾语+动词原形+其他
Don’t let Jim do that.     
Don’t let us go, please.
4) 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”。例如：
NO PHOTOS!禁止拍照！
No parking!
注意： 
1).在表达请求或劝告时，有时为了表示委婉的语气，可以在句首或句末please，但是如果please加在句末，应用逗号将其与前面的部分隔开。
Sit down, please.
Please look after the twins.
2). 在意思比较明显的情况下，可以把谓语动词省略。
This way, please.
3). 有时为了加强语气，可以在动词前使用do.
Do be careful！一定要小心！
4). 有时为了强调对方，也可加上主语you，人名或everybody, anybody等不定代词。
You sweep the floor and I clean the window.
Stand up, everybody.
5).有时为了明确向谁提出请求或发出命令，可加称呼语，但称呼语要与句子用逗号隔开。
Put the shirt on the bed, Jim.
4祈使句的反意问句祈使句的反意疑问句须按其句子结构及讲话人的语气来决定其疑问部分,通常有以下三种形式：
1).祈使句为肯定句式，其反意疑问句表示请求时，通常用will you；表示邀请、劝说时，用won’t you。例如：
Be sure to write to us, will you?你一定要给我们写信，好吗？
Come to have dinner with us this evening, won’t you?
今晚来和我们一起吃饭，好吗？
2).祈使句为否定句式，其反意疑问句通常只用will you。例如：
Don’t smoke in the meeting room, will you?
不要在会议室抽烟，好吗？
3). Let开头的祈使句构成反意疑问句时，除Let’s用shall we外，其它均用will you。例如：
Let the boy go first, will you?让个那男孩先走，好吗？
Let’s take a walk after supper, shall we?
晚饭后我们去散步，好吗？
5祈使句的回答祈使句的动作通常是表示将来发生的动作，所以回答祈使句时，一般用will或won’t。
在回答具有否定意义的祈使句时，要注意两点：
1) 形式一致(即Yes与will保持一致；No与won’t保持一致)
2) 意思相反(即Yes是“不”的意思；No是“是”的意思)。
在回答时，要注意分析上下文语境中所提供的条件。例如：
--- Don’t go out, please. It’s raining heavily outside.
请不要出去。外面雨下得很大。
---- Yes, I will. I have to meet my brother at the airport.
不行，我得去机场接我弟弟。
6祈使句与陈述句的并列使用祈使句后接陈述句时，须用连接词连接。如果祈使句与陈述句表示的是一种顺承关系时，要用并列连词and来连接；如果祈使句与陈述句存在一种否定条件关系时，要用并列连词or来连接。例如：
Leave it with me and I will see what I can do.
把它留给我吧，我想想有没有办法。
Hurry up, or we’ll be late.
快点，否则我们要迟到了。
7祈使句与条件状语从句的连用祈使句与条件状语从句连用时，条件状语从句可置于祈使句前或后。例如：
Tell him to make a phone call to me if he comes here tomorrow.
如果他明天来这儿的话，叫他给我来个电话。
8.祈使句的强调形式祈使句的强调形式通常在肯定祈使句式前加上助动词Do。例如：
Do shut up!快住口！
9特殊形式的祈使句在英语中，有些祈使句不是以动词原形来引起一个祈使句，而是以一个名词短语来充当，且后接一个带有并列连接词的分句。实际上，这个充当祈使句的名词短语相当于一个条件状语从句。例如：
More water and the young trees couldn’t have died.
＝If you had given them more water, the young trees couldn’t have died.
如果你给那些小树多浇点水，他们就不会死了。
10运用祈使句的误区祈使句往往容易与不定式、分词或条件状语从句相混淆。
___________ your composition carefully, some spelling mistakes can be avoided.
A. Having checked    B. Check
C. If you check       D. To check　
巩固练习：一、单项选择：
1. Please ____, they’re having a meeting.
A. not be so noisy   B. be quite   C. mustn’t talk   D. no speaking
2. ____ to meet me at the station. I’ll be waiting there.
A. Not to forget    B. Not forget   C. Forget not    D. Don’t forget
3. It’s a fine day. Let’s go fishing, ____?
A. won’t we       B. will you    C. don’t we     D. shall we
4. Don’t smoke in the meeting-room, ____?
A. do you         B. will you     C. can you     D. could you
5. –Don’t forget to come to my birthday party tomorrow. -I ____.
 A. don’t          B. won’t        C. can’t       D. haven’t
6. If you are tired, ______ a rest.
A. have       B. having    C. to have        D. had
7. ______ me go. It is very important for me.
A. Do let      B. Let do    C. Doing let       D. To do let
8. He is not honest. ______ believe him.
A. Not        B. Don’t     C. To not         D. Not to
9. _____ up early tomorrow, or you can’t catch the train.
A. Getting     B. Get       C. To get         D. Got
10. _____ in the street. It’s dangerous.
A. Not play    B. Not to play  C. Don’t play     D. Don’t to play
11. Please ______ me some money, will you?
A. lend        B. lending    C. borrow         D. borrowing
12. The film is about to begin. Please ______ seated.
A. be         B. are        C. is              D. being
13. ____ down the radio. The baby’s asleep in the next room.
A. Turning     B. To turn     C. Turned         D. Turn
14. Lucy, ____ the door or someone will come in.
 A. close       B. closes      C. not close        D. is closing
15. ____ and play football in the street after lunch.
A. Let’s not to go  B. Let’s not go   C. Let’s don’t go D. Not let’s go
16. A sign with the words“____” is often found in a bus.
A. Not parking   B. Not smoking   C. No parking   D. No smoking
17. ____ Chinese in you English class.
A. Not speak    B. Don’t speak   C. Speak not   D. Don’t speaking
18 . _____ the boxes. You may use them later.
A. Keep        B. Keeping     C. To keep      D. Kept
19. If you want to stay, let me know, ______?
A. will you      B. shall we     C. do you       D. do we
20. Never come late again, ______?
A. will you      B. won’t you    C. do you      D. does he
21. The TV is too loud. Please________.
A. turn it down        B. to turn it down   
C. turn down it        D. to turn down it
22. _______ late again, Bill!
 A. Don't to be   B. Don't be   C. Not be   D. Be not
23. _______ cross the road until the traffic lights turns green.
  A. Not    B. Won't    C. Doesn't     D.  Don't
24. Please help me carry it, ______?
  A. will I   B. will you   C. shall I   D. shall we
25. Don't make so much noise, ______?
  A. will you   B. won't you   C. shall we   D.  do you
26. Do you know the girl ______under the tree?
  A. stand   B. to stand   C. standing   D. stood
27. Kate, _______ your homework here tomorrow.
  A. bring   B. brings   C. to bring   D. bringing
28. ________ me the truth, or I'll be angry.
  A. Telling   B. To tell   C. Told   D. Tell
29. I've kept the dog _______Maomao for a long time.
  A. name   B. named   C. naming   D. to name
30. Don't you know that _______ is good for our health?
  A. swim   B. swimming   C. swam   D. swims 
二. 用括号内所给动词的适当形式填空。
1. It’s an important meeting. _______ (not, be )late.
2. ________ (not,make) any noise! Your mother is sleeping.
3. ________ (not, speak) with your mouth full of food and ________ (be) polite.
4. ________ ( not, talk) and ________ (read) aloud.
5. ________ (not,leave) your homework for tomorrow, Larry.
6. ________ (look) out! A car is coming.
7. _______ (give) us ten years and just see what our country will be like.
8. _______ (not, let) the baby cry.
9. Wear more clothes or you _______ (catch) a cold.
10. Let’s _______ (not, say) anything about it.
三、句型转换
11. Will you please read it again more slowly? （改为祈使句）
   _____ _____ again more slowly, please.
12. If you don't listen to me, I'll go. （改为同义句）
   _____ _____ me, or I’ll go.
13. Let's watch the sports games.  （改为反意疑问句）
   Let's watch the sports games, _____ _____?
14. The teachers often tell the students not to be careless. （改为祈使句）
_____ _____careless, please.
15. Please sit next to Nancy.  （改为否定句）
_____ _____ next to Nancy.
16. Don't forget to turn off the lights, please. （改为反意疑问句）
Don't forget to turn off the lights, _____ _____?
17. If you move, you'll die. （改为同义句）
_____ _____, or you'll die.
18. Come to my house tomorrow.  （改为反意疑问句）
Come to my house tomorrow, _____ _____?
19. 这是一个坏了的被子。 （翻译句子）
This is a ______ ______.
20. 让我们去帮帮那个哭泣的女孩吧。 （翻译句子）
Let’s go and help the _____ _____, please.  
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