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1/4祈使句（一）概念：用来表示请求、命令、叮嘱、邀请、劝告的句子是祈使句。（二）一般祈使句（省略第二人称主语you）1.肯定句：动词原形+……Bebrave.Standup.Stoptalking!Comeonandjoinus!a.有时，为了加强语气，可以在动词之前加do.Dostudyhard.Dositdown.b.为了使语气显得客气，可在祈使句的句首或句尾加上please.Please在句尾时，之前一定要加一个逗号。Pleasecomehere.Gothisway,please.c.祈使句有唤语，一定要用逗号隔开，放在句首或句尾。LiMing,comehere.Hereyouare,Eric.2.否定句：Don’t+动词原形+……Don’tswimintheriver.Don’tbelate.Pleasedon’tbenoisy.Don’ttellher,please.（三）Let祈使句（含有第一、三人称主语）1.肯定句：Letsb.dosth.Let’sgoswimmingonSunday.Letmetryagain.LetTomgotherehimself.Letthenewsbeknown.Leteachmandecideforhimself.2.否定句：Letsb.notdosth.或Don’tletsb.dosth.Don’tletherwastetime.Don’tlethimhearyousaythat.Lethernotdoitalone.Let’snotsayanythingaboutit.2/4Don’tletthemplaywithfire.3.注意：Let’s表示包括对方。Letus表示不包括对方。Let’sgo,shallwe?（包括对方）Letusgo,willyou?（请求对方许，不包括对方）（四）句型转换：祈使句+and/or+陈述句祈使句相当于if引导的条件状语从句。Useyourhead,andyouwillfindaway.=Ifyouuseyourhead,youwillfindaway.Workhard,oryouwillfail.=Ifyoudon’tworkhard,youwillfail.练习：Comeearly,andyouwillcatchthefirstbus.=Comeearly,oryouwillmissthefirstbus.=连词：1、and,then,andthen就，那么2、or,orelse,otherwise否则，要不然比较：1、Comeearlyandyouwillcatchthefirstbus.早点来，你就能赶上第一班车。2、Comeearly,oryouwillmissthefirstbus.早点来，不然赶不上第一班车了。3、Useyourhead,thenyouwillfindaway.开动脑筋，那么你就能找到办法。4、Useyourhead,oresle,youwon'tfindaway.开动脑筋，否则你就找不到办法。5、Workhard,andthenyouwon'tfail.努力干，你才不会失败。6、Workhard,otherwiseyouwillfail.努力干，不然你会失败的。总结：六兄弟VBLDPNTips：祈使句指的是表示命令、请求、建议或劝告的句子。主语常省略，动词用原形。一、用括号内所给动词的适当形式填空。1.__________(not,be)late.2.____________(clean)thedressingtable.3.____________(not,speak)withyourmouthfulloffood.3/44.____________(not,talk)and____________(read)abook.5.____________(not,drop)thenicevase,Sam.6.____________(look)out!Acariscoming.7.____________(give)ustenyearsandjustseewhatourcountrywillbelike.8.____________(not,let)thebabycry.9.Openthewindowand____________(shut)thedoor.10.Let’s____________(sweep)thefloor.二、选择填空()1.Thedoctorsays:“________worksohard”AStopBDon’tCCan’tDNo()2.________inbed.It’sbadforyoureyes.ANottoreadBDon’treadCDon’ttoreadDNotread()3.Please________lookoutside.Lookattheblackboard.AnotBdon’tCaren’tDcan’t()4.TheTVistooloud.Please________.A.turnitdownB.toturnitdownC.turndownitD.toturndownit()5.Kate,_______yourhomeworkheretomorrow.A.bringB.bringsC.tobringD.bringing()6.________methetruth,orI'llbeangry.A.TellingB.TotellC.ToldD.Tell()7.________careful!A.BeB.BeingC.TobeD.To()8.Don't_______intheriver.A.swimB.swimmingC.swamD.swims三、句型转换1.Willyoupleasereaditagainmoreslowly?（改为祈使句）__________againmoreslowly,please.2.PleasesitnexttoNancy.（改为否定句）__________nexttoNancy.3.Cometomyhousetomorrow.（改为否定句）_____cometomyhousetomorrow.4.Weartheglasses!（改为否定句）______weartheglasses!5.Don’twashyourhands!(改成肯定句)_______yourhands!4/4