高中英语语法——祈使句ppt课件.ppt

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1、GrammarImperatives(祈使句)Nosmoking!Don’tdrink!Attention！Parking!Whatdotheymean?Grammar-1.Look&SayLookatthesignsandsaywhattheydo.Don’tgofasterthan90kph.Turnright.Don’twalk./Nopedestrians.Don’tturnleft./Noleftturn.Don’tstop./NoparkingTheygiveinstructions一.祈使句的定义用于表达命令、请求、劝告、警告、禁止等的

2、句子叫做祈使句。Lookatthefollowingsentences:Goandwashyourhands.（去洗手。——命令）Bequiet,please.（请安静。——请求）Bekindtooursister.（对姊妹要和善。——劝告）Lookout！Danger！（小心！危险！—警告）Keepoffthegrass.（勿践草坪。——禁止）Canyoutellmewhatareimperatives?定义:祈使句无_____，主语you常______；动词_____谓语当，句首加_____变否定；主语省去原形Don’tArethefollowi

3、ngsentencesimperative?(discussinpairs)Heisalwayssleepingintheclass.It’sabeautifulday,isn’tit?Tellmeyourname,please?Willhecometonight?Mary,comehere!(√)(×)(×)(×)(√)二.祈使句的结构1.ObservationWhat’rethefeaturesofimperative?Listentomecarefully.Comeinandsitdown,please.Don’tclosethewindow–

4、it’shot.Bequiet!Beagoodboy!Let’stryourbesttoimproveourenvironment.ListenComesitDon’tBeLet’sBe2.ConclusionDo型（以行为动词开头）Standup!Don’tstandup!/Neverstandup!Be型（以be动词开头）Becareful.Don’tbelate./Neverbelate.Let型（以let开头）Lethimin.Letmehelpyou.◆肯定结构:◆否定结构:①Do型和Be型的否定式都是在句首加don’t构成。如:不要忘记我

5、!Don’tforgetme!/Don’tbelate!②Let型的否定式有两种:“Don’t+let+宾语+动词原形+其它成分”和“Let+宾语+not+动词原形+其它成分”。如:别让他走。Don’tlethimgo./Lethimnotgo.③有些可用no开头,用来表示禁止性的祈使句。如:禁止吸烟！禁止钓鱼！Nosmoking!Nofishing!用祈使句完成下列句子。1._____onthepavement（人行道）.2._____inthebicyclelanes.3.______atredtrafficlights.4.______ther

6、ulesoftheroad.GoRideStopKeepgo,keep,look,ride,stop,stay,watchout5._________forpedestrians（行人）.6.______behindyoubeforeyouturnrightorleft.7.__________inthemiddleoftheroad.LookWatchoutDon’tstaygo,keep,look,ride,stop,stay,watchout三.祈使句中应注意的几个问题Dobepatient!Dositdown.Dowritebackwheny

7、oureceivehisletter.Tom,youcleantheroom.Don’tyoubelateagainnexttime!Whatisdifferentnow?1.加强祈使句语气的方式:Do/you+动词原形此句型为“条件与结果”并存的句式，其中的祈使句可转化为if条件句。e.g.Workhardandyouwillsucceed.=Ifyouworkhard,youwillsucceed.Hurryup,oryouwillmissthelastbus.=Ifyoudon’thurryup,youwillmissthelastbus.2.

8、祈使句(,)+and/or+简单句是一种固定句式。这一句式也可以演变为“名词性短语+and+简单句”的形式。