as的用法(2).ppt
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1、as用法小结用法小结.一、引导让步状语从句(倒装)一、引导让步状语从句(倒装)1.Strong as he is,he is afraid of pain.2.Slowly as the tortoise walks,it can beat the rabbit.3.Doctor as she is,she cant cure her own disease.4.Try as he does,he never seems able to do the work beautifully.adj./adv+as+S+be/v.n.+as+S+be(句首名词不带冠词句首名词不带冠词)v.+as+S+
2、do/does/did。.二、引导时间状语从句二、引导时间状语从句1、I read the letter as I walked along the river.2.As the wealth of the country increases,more waste will be produced.3.As I was going out the telephone rang.4.Mother was worried because little Alice was ill,especially as father was away.(一边一边一边一边)(随着随着)(正要干正要干突然:同时发生
3、突然:同时发生)(当当时候时候).when/while/as1.She can write only when the baby is asleep.2.My pen dropped on the ground when I was walking in the park.3.I was drawing when he came in.4.We must strike while the iron is hot.5.While we were talking,the teacher came in.6.As I looked,some one came near.7.As I get olde
4、r I get more optimistic.。1、when 引导的从句既可以表时间位置,也可表示一段时间,引导的从句既可以表时间位置,也可表示一段时间,因此从句既可以和瞬间动词因此从句既可以和瞬间动词(arrive,begin,borrow,lend,go,come,leave,stop,finish,die,join)连用,也连用,也可使用持续动词可使用持续动词(be,lie,stay,live,study);2、while引导的时间状语从句表示时间的延续,即表示一段引导的时间状语从句表示时间的延续,即表示一段时间,而不是瞬间,因此,不能与瞬间动词连用;时间,而不是瞬间,因此,不能与瞬间
5、动词连用;3、as不能分先后,而指并相发生,尤指短动作或事件同时不能分先后,而指并相发生,尤指短动作或事件同时发生。发生。as还可以说明两种正在发展或变化的情况。还可以说明两种正在发展或变化的情况。4、when与与while的另一个区别:的另一个区别:when从句的动作既可以与从句的动作既可以与主句的动作同时发生,亦可先后发生,而主句的动作同时发生,亦可先后发生,而 while从句所表从句所表示主句动作发生在示主句动作发生在while从句所表达的时间段之内。从句所表达的时间段之内。A.When you telephoned me,I was drawing a picture.B.The te
6、lephone rang while I was having a shower.as用法小结用法小结.三、引导原因状语从句三、引导原因状语从句1.As the weather was fine,we decided to walked to the restaurant.2.Tired as they were,they went to bed as they came back.3.She lied to us because she had to do in order to get a job.辨析:一般来说,辨析:一般来说,as表示听者已知的原因,因而常位表示听者已知的原因,因而常位
7、于句首,而于句首,而because表示听者未知的原因,因而常位表示听者未知的原因,因而常位于句尾,成为信息的焦点。因此,于句尾,成为信息的焦点。因此,as不能回答不能回答why的的问题,也不能在强调句型中作为被强调的成分。问题,也不能在强调句型中作为被强调的成分。as用法小结用法小结.三、引导方式状语从句三、引导方式状语从句1.When at Rome,do as Romans do.2.I have changed it like you suggested.3.Please try to write as I do/like me.辨析:做辨析:做“如如”“像像”“按照按照”解的解的as可
8、用作连可用作连词,其后可引出方式状语,在正式英语里词,其后可引出方式状语,在正式英语里like只能做只能做介词不能做连词。当介词不能做连词。当as和和like都做介词时,词义不同,都做介词时,词义不同,as表示表示“作为作为”以以资格资格“”,like则表示则表示“像像”“与与相似相似”as用法小结用法小结.四、四、asas表示倍数的句型表示倍数的句型1.Tom is as tall as I.2.Jack is not as/so clever as his sister.3.This pencil is half(a quarter)as long as that one.4.Sound
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