初中英语祈使句ppt课件.pptx
初中英语,祈使句,Be happy!,Be quiet,please.,Wash your hands.,clap your hands,Matching Game,Be happy!,Be quiet,please.,Wash your hands.,clap your hands,Matching Game,一、祈使句,1、祈使句的概念,祈使句是用来表示请求、命令、叮嘱、邀请、劝告或祝愿等的句子。Go and wash your hands.(表命令)Be quiet,please.(Please be quiet.)(表请求),Be kind to your sister.(表劝告)Watch your steps.(表警告)No parking.(表禁止),2、祈使句的特点,祈使句通常省略主语you,以动词原形开头,末尾可用句号或感叹号。Go and wash your hands.(表命令)Be quiet,please.(Please be quiet.)(表请求)祈使句没有疑问句的形式,一般只有肯定和否定两种形式。,1、安静点/快点。Be _/_.2、做一个好学生!3、过街的时候要小心。Be _when crossing the street.,二、祈使句的肯定形式,以系动词be开头的祈使句,这种祈使句的常用结构:be+形容词/名词Be quiet/quick!Be a good student!Be careful when crossing the street.,1、请进!2、请打开你的书!3、请把它们收起来!,2-2 以实义动词开头的祈使句,这种祈使句的常用结构为:动词原形+宾语(+其他)Come in,please!Please open your books!Put them away!,二、祈使句的肯定形式,Know-point 2,1、让我帮助你吧。2、我们去公园吧。Let _.,Translate those sentences,2-3 let型(let+宾语+动词原形+其他)Let me help you.Lets go to the park.,二、祈使句的肯定形式,把下列句子变成否定句Be careless!Be late again next time!,3-1 be型A.Dont be+其他成分(形容词、名词或介词短语)Dont be careless!Dont be late again next time!,三、祈使句的否定形式,Know-point 3,3-1 be型B.用否定副词never来表示 Never be careless!Never be late again next time!注意:在这种两种句型中,be不能省略 not不可置于be之后,三、祈使句的否定形式,把下列句子变成否定句Believe him!Open the door!,3-2 do型A.Dont+动词原形+其他Dont believe him!Dont open the door!B.用否定副词never来表示Never believe him!Never open the door!,三、祈使句的否定形式,1、让她不要做那件事。2、让他不要想这件事。,3-3 Let型 A.Let+宾语+not+动词原形+其他Let her not do that.让她不要做那件事。Let him not think about it.让他不要想这件事。,三、祈使句的否定形式,1、不要让他做那件事。2、请不要让我们走。,3-3 Let型 B.Dont+let+宾语+动词原形+其他Dont let Jim do that.不要让他做那件事。Dont let us go,please.请不要让我们走。,三、祈使句的否定形式,What do the signs mean?,3-4 在公共场合的提示语中,否定祈使句常用“No名词/动名词(V-ing形式)”结构,表示“禁止做某事”。例如:,三、祈使句的否定形式,No photos!,No parking!,No Smoking,还有哪些常见的标语呢?,4、祈使句的其它用法(*),4-1 在表达请求或劝告时,有时为了表示委婉的语气,可以在句首或句末please,但是如果please加在句末,应用逗号将其与前面的部分隔开。Sit down,please.Please look after the twins.4-2 在意思比较明显的情况下,可以把谓语动词省略。This way,please.,4-3 有时为了加强语气,可以在动词前使用do.Do be careful!一定要小心!4-4 有时为了强调对方,也可加上主语you,人名或everybody,anybody等不定代词。You sweep the floor and I clean the window.Stand up,everybody.4-5 有时为了明确向谁提出请求或发出命令,可加称呼语,但称呼语要与句子用逗号隔开。Put the shirt on the bed,Jim.,1.Its an important meeting._(not,be)late.,1.Its an important meeting._(not,be)late.,Dont be,1.Its an important meeting._(not,be)late.,2._Dont make_(not,make)any noise!,3._(look)out!A car is coming.,3._Look_(look)out!A car is coming.,4._(not,let)the baby cry.,4._Dont let_(not,let)the baby cry.,5.Lets _(not,say)anything about it.,5.Lets _not say_(not,say)anything about it.,