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英语祈使句讲解八年级上册unit8语法定义：用于表达命令、请求、劝告、警告、禁止等的句子叫做祈使句。祈使句通常省略第二人称的主语；祈使句的动词都为原形。→Goandwashyourhands.→Bequiet,please.（Pleasebequiet.）→Bekindtooursister.→Watchyoursteps.→Lookout！Danger！→Keepoffthegrass.→Noparking.祈使句的类型：肯定祈使句否定祈使句以let开头的祈使句No+动名词/名词其它类型祈使句肯定祈使句一、直接以动词原形开头,please可在句首,也可在句末。Do型。直接以动词原形开头Be型。Be+表语Becareful.Bequiet.Pleaselookattheblackboard.Listentomecarefully.Gohomeatonce.二、肯定祈使句的回答：肯定回答：Yes,Iwill.否定回答：Sorry,Ican’t.I’mbusydoingmyhomework.否定祈使句否定祈使句=Don’t+肯定祈使句（Don’t+V原）→Don’ttalkinclass.→Don’teatinclass.→Don’truninthehallway.→Don’tdrawonthewall.→Don’tthroweverywhere.二、否定祈使句的回答：→Ofcourse,Iwon’t.→Sorry,Iwon’tdothatnexttime.以let开头的祈使句一、LetsbdosthLetsbnotdosthLetusmakefruitsalad.Letyourfathercallmeback.Lethimnotplaybasketballhere.Letthemnotplaythedrumsnow.二、以let开头的祈使句的回答：→That’sagoodidea./Thatsoundsgood.→Oh,No.It’stoohot.→Oh,No.Let’swatchTVathome.No+动名词/名词Nosmoking!Nosmokinginthemeetingroom!Noparking!Nophotos!其它类型祈使句Whydon’tyoudosth?=Whynotdosth?相当于Pleasedosth.Whydon’tyoustandup?=Whynotstandup?Whydon’tyougoouttoplay?=Whynotgoouttoplay?1.thepopcornmachine.A.TurnonB.TurningonC.ToturnonD.Turnson2.thesandwichbeforeyouwashyourhands.A.EatingB.NoteatingC.Don’teatD.Noteat3.---lateforthemeetingnexttime.---Sorry,Iwon’t.A.Don’tB.Don’tbeC.won’tbeD.Benot4.Let’stoschoolbybike.A.notgoB.nottogoC.don’tgoD.notgo5.abananamilkshakeiseasy.A.MakeB.MakesC.MakingD.Made6.---Don’tboilthevegetabletoolong.---.A.Yes,Iwon’tB.Yes,IwillC.No,IwillD.No,Iwon’t7.addingsomerelishtothesoup?A.WhynotB.Whydon’tC.WhataboutD.Whatfor8.---Don’tdrivetoofast!It’sdangerous.---.Iwillslowdown减速.A.GreatB.CertainlyC.CoolD.Sorry9.---Jace,let’splaytennis.---.A.ThatsoundsgoodB.Yes,IdoC.Don’tworryD.You’rewelcome10.---Pleasecutupthetwobananas.---.A.Yes,IcanB.Yes,IwillC.No,Idon’tD.Sorry,Ican’t