八年级英语上册Unit4DoityourselfGrammar课件1（新版）牛津版.ppt

Unit4,Doityourself,Grammar,Givinginstructions,Putupapictureonthewall.,Putupashelfonthewall.,Westartasentencewiththebaseformofaverbwhenwewanttotellpeoplewhattodo.,Dontswimhere.,Dontparkyourbikehere.,Weadddontinfrontoftheverbwhenwewanttotellpeoplenottodosomething.,Givinginstructions,1.祈使句的概念祈使句表示请求、命令等。它的主语是you（听话人），通常不说出。祈使句肯定结构中的谓语动词一律用动词原形。祈使句末用惊叹号或句号，句子用降调。2.祈使句的结构1)祈使句的肯定结构Do型（以行为动词原形开头），例如：Sitdown!坐下！Standup!起立！,Be型（以be开头），例如：Bequiet!安静！Becareful！小心！Let型（以let开头），例如：Letmetry.让我试试看。Letslookatthemap.让我们看看地图。lets是letus的简略式。,表示请求、劝告的祈使句还常常在句前或句末加上please,构成句式：Please或,please.以使语气更加缓和或客气。例如：Pleasestandup.或Standup,please.请站起来。Pleasehavearest.或Havearest,please.请休息一下。,2)祈使句的否定结构，一律在肯定结构前加Donot(Dont)。例如：Dontgothere,please.请别去那儿。Dontbelateforclass!上课别迟到！Dontlethimin.不要让他进来。,Parkyourbikehere.,Pleasegoslowly.,Moreinstructions,Dontsmokehere.,Dontfishhere.,Moreinstructions,Bequiet,please.,Dontmakeanynoise.,Moreinstructions,Howtomakecards,1.Cutoutpiecesofcardwithapairofscissors.,2.Writesomewordsorasentenceoneachcard.,Howtomakecards,3.Drawapictureaboutthewordsorsentenceontheothersideofthecard.,4.Lookatthepictureandtrytosaywhatisontheotherside.,Pleasedontgiveup.Keeptryingandyouwillfindyoucanrememberthingsbetter.,should&hadbetter,1.PleaseknowalittleaboutDIY.,YoushouldknowalittleaboutDIY.,Weuseshouldandhadbetterwhengivingadviceandtellingpeoplewhatisthebestorrightthingtodo.,YouhadbetterknowalittleaboutDIY.,2.Pleaseputinabrighterlightintheroom.,Youshouldputinabrighterlightintheroom.,Weuseshouldandhadbetterwhengivingadviceandtellingpeoplewhatisthebestorrightthingtodo.,Youhadbetterputinabrighterlightintheroom.,3.Donthitthepipe.,Youshouldnot/shouldnthitthepipe.,Youhadbetternothitthepipe.,Weuseshouldandhadbetterwhengivingadviceandtellingpeoplewhatisthebestorrightthingtodo.,4.Dontpaintthewholeroomblue.,Youshouldnot/shouldntpaintthewholeroomblue.,Youhadbetternotpaintthewholeroomblue.,Weuseshouldandhadbetterwhengivingadviceandtellingpeoplewhatisthebestorrightthingtodo.,当我们给他人提建议时，可以用hadbetter和should，表示“最好”或“应该”做某事，hadbetter的语气比should强一些。Youhadbetterrefrigeratethebeerbeforedrinkingit.喝啤酒前你最好先把它冷冻一下。Youshouldexercisemore.你应该多锻炼。,hadbetter(常简略为dbetter)，是一固定词组，后面必须跟动词原形，没有人称和数的变化。构成：hadbetterdosth.句型。Youdbettergotohospitalatonce.你最好立即去医院看病。Tom,youdbettergotheretoday.汤姆，你最好今天去那儿。hadbetter的否定式是将not直接放在hadbetter的后面。Youhadbetternotmissthelastbus.你最好不要错过末班公共汽车。,should后面也要跟动词原形，且没有人称和数的变化。Youshouldstopsmoking.你应该戒烟。should的否定式是shouldnot/shouldnt。Youshouldntdrinkanddrive.你不应该喝酒后开车。,DIYadvice,Readtheadviceandmakesentenceswithshould(not)orhadbetter(not).,beginyourworkwithoutreadingthem,Youshouldntbeginyourworkwithoutreadingthem.,Youhadbetternotbeginyourworkwithoutreadingthem.,DIYadvice,Readtheadviceandmakesentenceswithshould(not)orhadbetter(not).,joinaDIYclubtolearnmoreaboutit,YoushouldjoinaDIYclubtolearnmoreaboutit.,YouhadbetterjoinaDIYclubtolearnmoreaboutit.,DIYadvice,Readtheadviceandmakesentenceswithshould(not)orhadbetter(not).,bepatient,Youshouldbepatient.,Youhadbetterbepatient.,DIYadvice,Readtheadviceandmakesentenceswithshould(not)orhadbetter(not).,buysometolearnmoreaboutit,Youshouldbuysometolearnmoreaboutit.,Youhadbetterbuysometolearnmoreaboutit.,DIYadvice,Readtheadviceandmakesentenceswithshould(not)orhadbetter(not).,playwiththemwhenyoudoDIYjobs,YoushouldnotplaywiththemwhenyoudoDIYjobs.,YouhadbetternotplaywiththemwhenyoudoDIYjobs.,1.Youshould/hadbetterbuysometolearnmoreaboutit.,2.Youshould/hadbetterjoinaDIYclubtolearnmoreaboutit.,3.Youshouldnot/hadbetternotbeginyourworkwithoutreadingthem.,4.Youshouldnot/hadbetternotplaywiththemwhenyoudoDIYjobs.,5.Youshould/hadbetterbepatient.,1.当我们向他人发出命令、提出要求或建议时，常使用祈使句。其主语通常不明确表示出来。其否定形式是在动词原形前加donot/dont。为了表示客气和礼貌，可以加上please。2.当我们给他人提建议时，可以用hadbetter和should，表示“最好”或“应该”做某事。否定形式是hadbetternot和shouldnot/shouldnt。,Reflection,I.单项选择。,1.TheTVistooloud.Please_.A.turnitdownB.toturnitdownC.turndownitD.toturndownit2._lateagain,Bill!A.DonttobeB.DontbeC.NotbeD.Benot,3._crosstheroaduntilthetrafficlightsturngreen.A.NotB.WontC.DoesntD.Dont4._methetruth,orIllbeangry.A.TellingB.TotellC.ToldD.Tell,II.句型转换。,1.Willyoupleasereaditagainmoreslowly?(改为祈使句)_againmoreslowly,please.2.Ifyoudontlistentome,Illgo.(改为同义句)_me,orIllgo.3.Theteachersoftentellthestudentsnottobecareless.(改为祈使句)_careless,please.4.PleasesitnexttoNancy.(改为否定句)_nexttoNancy.,Readit,Listento,Dontbe,Dontsit,III.完成句子。,1.你应该在南京换火车。_changetrainsatNanjing.2.你最好在下雨前回家。_beforetherainstarts.