祈使句一、祈使句（ImperativeSentence）定义：用于表达命令、请求、劝告、警告、禁止等的句子叫做祈使句. 祈使句因对象（即主语）是第二人称，所以通常都省略。祈使句的动词都为一般现在时。例：Goandwashyourhands.（去洗你的手。命令）Bequiet,please.（Pleasebequiet.）（请安静。请求）Bekindtooursister.（对姊妹要和善。劝告）Watchyoursteps.（走路小心。警告） Lookout！Danger！（小心！危险！强烈警告，已如感叹句）Noparking.（禁止停车。禁止） 二、祈使句的否定形式祈使句的否定形式是在整个结构之前加dont或never。如：Dont you be nervous!你不要紧张!以let为引导词的祈使句的否定形式通常是在Lets或Let usme后加not。如：Lets not waste our time arguing about it!咱们别浪费时间争论这事了!Lets not say anything about it! 这事咱们谁也别说!但英式英语也用这样的表达：Dont lets say anything about it.三、祈使句的反意疑问句1祈使句的反意疑问部分为肯定形式，要用will。如：Pass me the book，will you?2Lets表示第一人称的祈使句，反意疑问句为“Shall we?”。如：Lets go for a walk，shall we?Lets forget it，shall we?3Let me和Let us 表示第二人称的祈使句，反意疑问句为“will you?”。如：Let us go for a walk，will you?4其它行为动词引起的祈使句，无论其陈述部分是否定还是肯定的祈使句，多用“will you?”，表一种客气的语气。如：Listen to me，will you?Dont tell anyone about it，will you?但在肯定的祈使句后有时也用“wont you?”表“提醒对方注意”或表“邀请”。如：Have a cup of coffee，wont you?Come in and take a seat，wont youwill you?四、祈使句用于两个重要句型中1“祈使句+and+表结果的陈述句”用来叙述肯定的条件。2“祈使句+or(else)+表结果的陈述句”用来叙述否定的条件，or(else)表示“否则；要不然”。试比较：Hurry up and youll catch the train. (If you hurry up，youll catch the train)Hurry up，or youll miss the train(If you dont hurry up，youll miss the train)（一）用括号内所给词的适当形式填空1Its an important meeting._ (not be) late.2_ (look) out!A car is coming!3_ (not make) any noise! The baby is sleeping.4Lets _(not say) anything about it.5_ (not let) the baby cry.6_ (read) aloud,please.7_ (not talk) with your classmate in the class.（二）选择题1Her doctor said:_ work so hardA stop B Dont C cant D No2Sindy,_ to be here at 8 oclock.A is sure B is sure that C will be sure D be sure3_ him the secret,will you?A Dont tellB Not to tellC Not tellingD No telling4Please _ look outside,look at the blackboard.A not B dont C arent D cant5John,read the text for us,_ ?A does he B will he C do you D will you6Lets do it at once,_ ?A shall we B will you C do we D do you7Let us do it at once,_ ?A shall we B will you C do we D do you8_ in bed, Its bad for your eyes.A Not to read B Dont read C Dont to read D Not read9_ smoking!A Dont B No C Dont to D Be not10. The TV is too loud. Please_.A. turn it downB. to turn it downC. turn down itD. to turn down it11. _ late again, Bill!A. Dont to beB. Dont beC. Not beD. Be not12. Please help me carry it, _?A. will IB. will youC. shall ID. shall we13.They are very tired. Why _ have a rest?A not theyB do not theyC dont theyD not to14 -You look rather tired. _ stopping to have a rest?- All right.A Why notB How aboutC Why not toD why dont15. Just _ to him, and you will see how unusual he is!A. to listenB. listenC. listenedD. listening16. _ the footpath and youll eventually hit the road.A. FollowB. FollowingC. FollowedD. to follow17. _ your radio down, or youll wake the neighbors.A. TurningB. To turnC. Having turnedD. Turn18. _ a bit closer and youll be able to see better.A. To comeB. ComingC. Having comeD. Come19. Make sure the iron isnt too hot _ youll burn the cloth.A. andB. orC. yetD. so20. Dont loosen your grip on the rope _ youll fall.A. soB. andC. orD. but21. Come on, get moving _ youll be late for school.A. butB. andC. orD. so22. Be quiet or you_ the whole house!A. are wakingB. have wakenC. will wakeD. wake23. Keep to the path or you _ your way.A. are losingB. have lostC. will loseD. lose（一）1.Dont2. Look3. Dont4. not say5. Dont let6. Read7. Dont talk（二）1-5 BDABD6-10 ABBBA11-15 BBCBB16-20 ADDBC21-23 CCC