资源描述：
《高中英语外研版必修四module2grammarppt课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、Period3Module2TrafficJamGrammarImperatives(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、
2、禁止等的句子叫做祈使句。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；朗读应当用______，句末常标______。主语省去原形Don’t降调感叹号A
3、rethefollowingsentencesimperative?(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–it’shot.
4、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!Don’tforgetme!②Let型的否定式有两种:
5、“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.______therulesoftheroad.GoRideStopKeepgo,keep,look,ride,stop,stay,watch
6、out5._________forpedestrians（行人）.6.______behindyoubeforeyouturnrightorleft.7.__________inthemiddleoftheroad.LookWatchoutDon’tstaygo,keep,look,ride,stop,stay,watchout三.祈使句的礼貌表达Doyouknowhowtomakeimperativesmorepolite?Discussinpairs:1.ObservationDoyouknowhowtomakeimperativesmorepolite?Openthewindow,p
7、lease.Willyougofishingwithmethisafternoon?Wouldyoudomeafavor?Couldyoushowmehowtogettotherailwaystation?Handthedictionarytome,willyou?Let’sgooutforawalk,shallwe?Whydon’tyougetsomethingtodrink?Isuggestwe(should)tak
