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1、重点语法:祈使句①肯定、否定形式②特例语法讲解:祈使句:表示请求、命令、禁止、劝告或建议的句子,特点是省略了主语。祈使句无主语,主语you常省去;动词原形谓语当,句首加don't否定变;朗读应当用降调,句末常标感叹号。●肯定结构:1.Do型(即:动词原形(+宾语)+其它成分)如:Pleasehaveaseathere.请这边坐。有的祈使句在意思明确的情况下,动词可省略。如:Thisway,please.=Gothisway,please.请这边走。Yougoandtellhim,Tom----------
2、---------------------------------------------------------------------------Openyourbooks,please.-------------------------------------------------------------------------------------Goandwashyourhands.-------------------------------------------------------
3、------------------------------Watchyoursteps.-------------------------------------------------------------------------------------Keepoffthegrass.-------------------------------------------------------------------------------------Lookout!Danger!---------
4、----------------------------------------------------------------------------2.Be型(即:Be+表语(名词或形容词)+其它成分)。如:Beagoodboy!要做一个好孩子!Bequiet,please.-------------------------------------------------------------------------------------Bekindtooursister.------------
5、-------------------------------------------------------------------------3.Let型(即:Let+宾语+动词原形+其它成分)。如:Letmehelpyou.让我来帮你。●否定结构:1.Do型和Be型的否定式都是在句首加don't构成。如:Don'tforgetme!不要忘记我!-------------------------------------------------------------------------------
6、------Don'tbelateforschool!上学不要迟到!Don’tclosethewindow.-------------------------------------------------------------------------------------2.Let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:Don'tlethimgo./Lethimnotgo.别让他走。Lethimgowithme,OK?3.
7、有些可用no开头,用来表示禁止性的祈使句。如:Nosmoking!禁止吸烟!Nofishing!禁止钓鱼!Noparking.三、用“Let‘s”时,把谈话者的对象包括在内;用“Letus”时,并不包括对方,如:Let'stryit,shallwe?Let’sgotoscool,shallwe?Letusdoitbyourselves,willyou?Exercises:祈使句指的是表示命令、请求、建议或劝告的句子。主语常省略,动词用原形。一、用括号内所给动词的适当形式填空。1.__________(no
8、t,be)late.2.____________(dust)thedressingtable.3.____________(not,speak)withyourmouthfulloffood.4.____________(not,talk)and____________(read)abook.5.____________(not,drop)thenicevase,Sam.二、选择填空()1.Thedoctorsays:“___