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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!ReadandobservethedifferenceTurn left!Turn right!Please go upstairs!Go downstairs!Walk on the zebra crossing!Dont
2、 smoke!Dont play football!Dont park your car!Please dont eat!Dont pick the flowers!Drawtheconclusion(得出结论)祈使句的结构如下：祈使句的结构如下：(Please)+do sth.(Please)+Dont do sth.肯定：肯定：否定否定：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 late.1.动词动词+2.Pleas
3、e+动词动词 3.人名人名+动词动词肯肯定定否否定定在动词前面在动词前面加加dont否否定定祈使句句式详解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）Lets(lets
4、b)+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：Bequiet!别说话!Comeearliernexttime.下次早点来。Haveagoodtime.愿你玩得痛快。Goandtellher.去告诉她吧。注：有时为了加强语气，可在动词前加do。如：Dobecareful.务请小心。Docomeontime.务必请准时来。祈使句句式详解4.关于以let开头的祈使句Letseatouttonight.我们今晚出
5、去吃饭吧。Letmehaveatry.我来试一试。Letmeshowyouhowtodoit.我来告诉你怎样做。Leteverymandohisbest.让每个人人尽其才。Letthemeatcookslowly.把肉用慢火炖。1.这类祈使句的否定式有两种形式。如：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。我们不要太急。2.let后用作宾语补足语的动词要用原形，不能用带后用作宾语补足语的动词要用原形，不能用带to的不定式的不定式。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please连用。P
6、lease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：Pleasedontgetangry.请不要生气。Pleasedrivemoreslowly.请开得慢一点。Pleasecutmeapieceofcake.请给我切一块蛋糕。Pleasetrytobequiet.请设法保持安静。Pleaserepeatwhatyouvejustsaid.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willyou,wontyou,wouldyou等。如：Mailthelettertoday,willyou?今天就把信发掉，好吗?Trytob
7、ebackbytwo,wontyou?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willyou。如：Dontforgettoposttheletter,willyou?请别忘了寄信。有时根据语境的需要，反意问句也可以用canyou,cantyou等：Givemesomecigarettes,canyou?给我些香烟，可以吗?Walkfaster,cantyou?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shallwe。如：Letsphonehernow,shallwe?我们现在就给她打电话，好吗?Letsgotothecine
8、matonight,shallwe?今晚咱们去看电影，好吗?2.当祈使句为Letus时：若表示请求，反意问句用willyou;若表示表示建议，则用shallwe。如：Letusknowyouraddress,willyou?请把你的地址告诉我们，好吗?Letusgoswimmingtogether,shallwe?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shallwe。而letus既可表示建议请求，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willyou和shallwe。Letsdomoreexercises.1.Call me when yo
9、u 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 D.no waste5._ higher,and you will see the house.OK.A.If you stand B.To stand C.When you stand D
10、.StandCCCADChoose 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 in,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 doo
11、r.A.Dont B.Will C.Not D.NoDCBBA11.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.All right13.Please turn on the light,_?A.are you B.shall we C.shall I D.will you14.Dont tell him the fact now,_
12、?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 youBDDCB16._ 6 and 4,and you will get ten.A.Added B.Adding C.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 weDABDC