初中英语语法状语从句课件.ppt

,状语从句20207/8,举例:#t Jim joined the army in 1989.i Jim joined the army when he was 20t He picked up some French words in Paristt He picked up some French words when he wasin Paristt 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 aletterWe 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 arrivedMy mother was cooking while I was doing my homeworkAs 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 since1978,