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1、祈使句,祈使句的定义,祈使句表示请求、命令、建议等等。谓语动词一律用原形。句子中通常不用主语，句末用惊叹号或者句号。,Turn left!,Turn right!,Walk on the zebra crossing!,Dont smoke!No smoking!,Dont park your car!,Dont eat!,Dont pick the flowers!,Go upstairs!,Read and observe the difference,Turn left!,Turn right!,Please go upstairs!,Go downstairs!,Walk on the
2、 zebra crossing!,Dont smoke!,Dont play football!,Dont park your car!,Please dont eat!,Dont pick the flowers!,Draw the conclusion(得出结论),祈使句的结构如下：(Please)+do sth.(Please)+Dont do sth.,肯定：,否定：,祈使句的句型,Be quiet.Please have a seat.David,pay attention.,Dont be afraid.Please do not make a noise.Alan,dont be
3、 late.,1.动词+2.Please+动词 3.人名+动词,肯定,否定,在动词前面加dont否定,祈使句句式详解,1.肯定的祈使句（1）动词原形+其他 Standup,please.=Pleasestandup.请起立。（2）Be+adj.Becareful!=Lookout!=Takecare!小心/当心！（3）Lets+动词原形 Letsgotoschooltogether.咱们一起上学去吧。,祈使句句式详解,2.否定的祈使句（1）Dont+动词原形Dontstandup.别站起来。Dontbecareless.别粗心。Dontletthemplaywithfire.别让他们玩火。（2
4、）Lets(letsb)+not+动词原形Letsnotsayanythingaboutit.对于这件事，咱们什么也别说。Letthemnotplaywithfire.别让他们玩火。,祈使句句式详解,3.祈使句谓语用何动词形式英语祈使句的谓语总是用动词原形。如：Be quiet!别说话!Come earlier next time.下次早点来。Have a good time.愿你玩得痛快。Go and tell her.去告诉她吧。注：有时为了加强语气，可在动词前加do。如：Do be careful.务请小心。Do come on time.务必请准时来。,祈使句句式详解,4.关于以let
5、开头的祈使句Lets eat out tonight.我们今晚出去吃饭吧。Let me have a try.我来试一试。Let me show you how to do it.我来告诉你怎样做。Let every man do his best.让每个人人尽其才。Let the meat cook slowly.把肉用慢火炖。,1.这类祈使句的否定式有两种形式。如：Lets not hurry./Dont lets hurry.我们不要太急。2.let后用作宾语补足语的动词要用原形，不能用带to的不定式。,祈使句句式详解,5.与please连用以使语气委婉为使语气委婉，通常将祈使句与ple
6、ase连用。Please可用于祈使句的句首(其后通常不用逗号)或句末(其前通常用逗号)。如：Please dont get angry.请不要生气。Please drive more slowly.请开得慢一点。Please cut me a piece of cake.请给我切一块蛋糕。Please try to be quiet.请设法保持安静。Please repeat what youve just said.请把你刚才说的话重复一遍。,祈使句与反意疑问句,一、基本原则若陈述部分为祈使句，反意问句通常用will you,wont you,would you等。如：Mail the le
7、tter today,will you?今天就把信发掉，好吗?Try to be back by two,wont you?设法两点之前回来，好吗?注：若陈述部分为否定式，则反意问句部分只用will you。如：Dont forget to post the letter,will you?请别忘了寄信。有时根据语境的需要，反意问句也可以用can you,cant you 等：Give me some cigarettes,can you?给我些香烟，可以吗?Walk faster,cant you?走快点，不行吗?,祈使句与反意疑问句,二、let型1.当祈使句为Lets时：反意问句总是用 s
8、hall we。如：Lets phone her now,shall we?我们现在就给她打电话，好吗?Lets go to the cinema tonight,shall we?今晚咱们去看电影，好吗?2.当祈使句为Let us时：若表示请求，反意问句用will you;若表示表示建议，则用 shall we。如：Let us know your address,will you?请把你的地址告诉我们，好吗?Let us go swimming together,shall we?我们一起去游泳好吗?注：lets只表示建议，所以其后反意问句总是用shall we。而let us既可表示建议
9、请求，也可表示建议(较正式)，其后的反意问句要根据这两种不同情况分别使用will you和shall we。,Lets do more exercises.,1.Call me when you get home.OK,_.A.I must B.I can C.I will D.I may2.Jim,_ me a hand.A.gives B.is giving C.give D.will give3.Let me _ on duty today.A.am B./C.be D.do4.Lets _ our time.A.not waste B.no wasting C.not to waste
10、 D.no waste5._ higher,and you will see the house.OK.A.If you stand B.To stand C.When you stand D.Stand,C,C,C,A,D,Choose the correct answer.,6._ forget to write to me when you _ get there next Tuesday.A.Dont;will B.Please;will C.Please;/D.Dont;/7.Please _ do it.A.he B.he let C.let him D.him8._ come i
11、n,please.A.Will B.Do C.Wont D.Did9._ careful!A.Be do B.Do be C.Not D.Not do10._ let anyone open the door.A.Dont B.Will C.Not D.No,D,C,B,B,A,11.Let John finish the work all by himself,_?A.shall we B.will you C.do you D.do we12.-Lets go home,shall we?-_.A.Thats right.B.Thats all C.Thats all right D.Al
12、l right13.Please turn on the light,_?A.are you B.shall we C.shall I D.will you14.Dont tell him the fact now,_?A.shall we B.shall you C.will you D.do you15.Let the children not make so much noise,_?A.shall we B.will you C.shall I D.do you,B,D,D,C,B,16._ 6 and 4,and you will get ten.A.Added B.Adding C
13、.To add D.Add17._ late again,or Ill report it to your father.A.Dont be B.You arent C.Cant be D.Arent 18.Dont interrupt her when she is speaking,_?A.wont you B.will you C.shall we D.shant we19._ get off the lorry until it stops.A.Do B.Cant C./D.Dont20.Lets not begin our supper until father comes back,_?A.will you B.wont you C.shall we D.shant we,D,A,B,D,C,
