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1、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
2、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
3、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
4、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 hur
5、ry 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1
6、Her 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
7、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
8、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 th
9、eyC 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. Following
10、C. 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 lo
11、osen 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
