as引导状语(课堂PPT).ppt

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,*,*,As 的词性及用法,1,as,conj.,adv.,pron.,prep.,固定用法,引导定语从句,引导,时间,状语从句,引导,原因,状语从句,引导,让步,状语从句,引导,方式,状语从句,引导,比,较,状语从句,2,一、,as作,关系代词,引导,定语从句,作正如、这一点解。如:Heisverycareful,ashisworkshows.,1.当先行词被thesame,such等词修饰时,常用as来引导定语从句。如:Suchacleverboyashecanlearnanythingquickly.,2引导非限制性定语从句，用来指代它前面的整个句子(即先行句)，意思是“这一点”。这个分句可以位于句首、句中或句末。如：As is well known，oceans cover more than 70 of the earth,3,二.as做连词,1.作“当的时候”,引导,时间状语从句,。注意与when、while的用法区别。,when作当的时候解,可以指较短的(一点)时间,也可指一段时间。,while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。,4,但属下列情形时,只用as,而不用when或while。,a)用于表示同一个人的两种动作交替进行,指“一边,一边”。如：Thegirldancesasshesingsonthestage.,b)表示两个同步发展的动作或行为,译为随着。如:As the sun rose the fog dispersed.,5,c)表示两个短促行为或事件几乎同时发生。如：,Ithoughtofitjustasyouopenedyourmouth.,d)后接名词表示某一年龄段时,用as。如：Asayoungman,hewasactiveinsports.,6,2.as=since,作既然、由于解,引导,原因状语,从句,常用来表示已为人们所知或显而易见的原因或理由。如:As/Sinceyourenotfeelingwell,youmaystayathome.Ashewasntreadyintime,wewentwithouthim.,7,3.as=inthewaythat,作像、按照的方式解,引导,方式状语从句,。如:HespeaksEnglishasAmericansdo.When at Rome,do as Romans do.,4.用于as.as.或notso/as.as.中,前一个as是副词,后一个as是连词,引导,比较状语从句,。如:Theyhelpedtheoldmanasoftenaspossible.Idontspeakenglishso/aswellashedoes.,8,5.作虽然、尽管解,引导,让步状语从句,。常用,倒装,语序,把从句中的表语、状语或动词原形放在as之前,即adj./adv./n.+as+主语+谓语+主句。如:Tiredastheywere,theywalkedon.Childasheis,heknowsalot.(child前不用冠词),9,三,、as 作副词,表示程度，意为“同样地”,用于as.as.或notso/as.as.中,前一个as是副词,后一个as是连词,引导,比较状语从句,。,10,四、,as作,介词,的用法:,as引导的介词短语大多用作状语,as译为作为;少数情况可引起宾语补足语。如:,Asaleaguemember,illtaketheleadineverything.(状语),Sheworksasadoctor.(状语),Theyhavemeasoneoftheirownchildren.(引起宾语补足语),11,五、含as的固定词组的用法,1as soon as作“一就”解，引导时间状语从句。eg：As soon as I get to Beijing，Ill write to you,2asso long as作“只要”解，eg；AsSo long as you study hard，youll make progress,3as ifthough常用来引导方式状语从句，作“好像，仿佛”解。如果从句中讲的是非真实情况，则用虚拟语气eg：She loves the child as ifthough he were her own,As ifthough也可用来引导表语从句，常用在“It appearslooksseems+as ifthough”句型结构中。eg；It appears as ifthough it is going to clear up看起来天要晴了。,12,4as to作“关于，至于”解。eg；There is no doubt as to his honesty,5as muchmany as作“多达”，“达到之多”解。eg：He can earn as much as 5000 dollars a month,6soas far as I know作“就我所知”解，在句中作插入语。eg：AsSo far as I know，he will come here next Monday,13,7as a result，as a result of表示“由于的结果”。eg：She died as a direct result of the accident,8，as well为“也，还”之意。eg：Come early，and bring your brother as well,9so as to，soas to若跟动词原形，表示目的或结果。eg：He studied hard so as to pass the exam,14,THANK YOU,15,