初中英语语法状语从句课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,状语从句,20207/8,举例:,#t Jim joined the army in 1989.,i Jim joined the army when he was 20,t He picked up some French words in Paris,tt He picked up some French words when he was,in Paris,tt I will help you if you ask me.,t He wears a T-Shirt though it is cold.,一、概念,1.定义:在主从复合句中,用于修饰主句中动词、形容词,或副词的句子,叫状语从句,2.类型:状语从句按其在句中的作用分为:时间、地点、原,因、目的、结果、条件、方式、让步、比较状语从句九类。,3.位置:由从属连词引导,可位于主句前,亦可位于主句后,位于句首时,用逗号与其后的主句隔开,状语从句,语法导学,【精讲】,1、时间状语从句,2、地点状语从句,状3、原因状语从句,语4、目的状语从句,从,句5、结果状语从句,6、条件状语从句,7、让步状语从句,状语从句,【时间状语从句】,语法导学,1.时间状语从句:,1)由when引导。,when指的是“某一具体的时间”。,如,When I came into the room,he was writing a,letter,We shall go there when we are free,状语从句,【时间状语从句】,语法导学,1.时间状语从句:,2)由 while,as引导。,whle指“在某一段时间里”,“在期间”,whil引导的动,作必须是持续性的。,as引导持续性动作,强调主句和从句的动作同时发生,从句,常译作“一边一边”,如,While it was raining,they went out.,He hurried home,looking behind as he went,状语从句,【时间状语从句】,语法导学,when,while,as的区别。,(1)when,while,as引导的从句都可以使用延续性动词,when,as都可以与非延续性动词连用,而 while则不能。,(2)when可表示瞬间,也可表示时间段,与主句所陈述的,动作,事情可同时发生,也可有先后。,while常用于连接同时进行的两个延续性动词相伴随而发生的,动作,as不指先后,尤指两个动作或事件同时发生,sA:The film had been on when we arrived,My mother was cooking while I was doing my homework,As I left the house,I forget the key.,状语从句,【时间状语从句】,语法导学,1.时间状语从句:,3)由 before,after引导。,before表示在之前。,after译为“在之后”。,如,Be a pupil before you become a teacher.,He arrived after the game started.,状语从句,【时间状语从句】,语法导学,1.时间状语从句:,4)由t,until引导。,til表示主句动词是持续性动作,常用肯定式,表示“直,到为止”。亦可用unt替换。,until表示主句动词是非延续性动词,常用否定式,表示,“直到才”“在以前不”,从句放在句首表示强调。,如,We waited till(until)he came back.,She didnt stop working until eleven oclock.,状语从句,【时间状语从句】,语法导学,1.时间状语从句:,5)由 since,as soon as引导。,状语从句在主句之前时一般用逗号与主句分开,如从句在主句,之后则不必用标点符号。,如,Great changes have taken place in China since,1978,