Unit6Unit6Turn left!Turn right!Walk on the zebra crossing! Go upstairs!Dont smoke!No smoking!Dont park your car!Dont eat!Dont pick the flowers!ReadandobservethedifferenceTurn left!Turn right!Dont smoke!Dont park your car!Please dont eat!Dont pick the flowers! Please go upstairs!Walk on the zebra crossing!Drawtheconclusion(得出结论得出结论) 祈使句的结构如下：祈使句的结构如下： (Please)+dosth. (Please)+Dontdosth.祈使句的句型祈使句的句型Bequiet.Pleasehaveaseat.David,Lookout.Dontbeafraid.Pleasedonotmakeanoise.Alan,dontbelate.1.动词动词原形原形+2.Please+动词动词原形原形 3.人名人名+动词动词原形原形肯肯定定否否定定在动词前在动词前面加面加dont否定否定祈使句的定义祈使句的定义祈使句表示祈使句表示请求、命令、建议请求、命令、建议等等。等等。谓语动词一律用谓语动词一律用原形原形。通常说话对象（主语）是第二人称通常说话对象（主语）是第二人称you,you常被省略，句末用常被省略，句末用惊叹号或者句号惊叹号或者句号。祈使句句式详解祈使句句式详解1.肯定的祈使句肯定的祈使句（1）动词原形动词原形+其他其他(与与please连用以使语气连用以使语气委婉委婉)Standup,please.=Pleasestandup.请起立。请起立。（2）Be+adj.Becareful!小心小心/当心！当心！Bequiet!别说话别说话!（3）Lets+动词原形动词原形Letsgotoschooltogether.咱们一起上学去吧。咱们一起上学去吧。祈使句句式详解祈使句句式详解2.否定的祈使句否定的祈使句（1）Dont+动词原形动词原形+其他其他Dontstandup.别站起来。别站起来。Dontforgetyourhomework.不要忘记你的作业。不要忘记你的作业。（2）Dont+be+adj.Dontbeafraid.别害怕别害怕Dontbecareless.别粗心。别粗心。（3）Dont+letsbdosth.Lets(letsb)+not+动词原形原形Dontletthemplaywithfire.别让他他们玩火。玩火。Letthemnotplaywithfire.让他他们别玩火。玩火。祈使句，无主语，只用动词就可以；祈使句，无主语，只用动词就可以；表示请求或命令，表示请求或命令， 加上加上please表客气；表客气；如果变成否定句，如果变成否定句， Dont开头是规律；开头是规律；No talking!是警示是警示, 祈使句用法要牢记。祈使句用法要牢记。1.Jim,_meahand.A.givesB.isgivingC.giveD.willgive2.Lets_ourtime.A.notwasteB.nowastingC.nottowasteD.nowaste3._higher,andyouwillseethehouse.OK.A.IfyoustandB.TostandC.WhenyoustandD.StandChoose the correct answer. 4._forgettowritetomewhenyougettherenextTuesday.A.DontB.PleaseC.NotD.Arent5.Please_doit.A.heB.heletC.lethimD.him6._letanyoneopenthedoor.A.DontB.WillC.NotD.No7._6and4,andyouwillgetten.A.AddedB.AddingC.ToaddD.Add8._lateagain,orIllreportittoyourfather.A.DontbeB.YouarentC.CantbeD.Arent9._getoffthebusuntilitstops.A.DoB.CantC./D.Dont10.Callmewhenyougethome.OK,_.A.ImustB.IcanC.IwillD.Imay11.Dontbelateagain.Sorry,_.A.ImayB.ImustC.IwontD.Iwillin classon the roadBe quiet.Take notes.Listen to the teacher carefully.Dont eat in class.Dont sleep is class.Walk on the zebra crossing.Be careful.Dont play football.Dont run fast.Dont push.Writeapassageaboutoneofthepictures.