grammar as 的用法

1、AS的用法的用法As 可作连词、关系代词、可作连词、关系代词、介词介词作连词时，可以引导各种状语从句作连词时，可以引导各种状语从句 1.作作“当当的时候的时候”解时解时,引导时间状语引导时间状语从句从句,表示两个动作同时或是表示两个动作同时或是 交替发生。交替发生。eg : The girl dances as she sings on the stage. As time went on / by, she became more and more worried. 2.当当As作作“既然既然”“”“由于由于”的解的解时，就是引导原因状语从句时，就是引导原因状语从句eg: As (= Sin

2、ce) youre not feeling well, you may stay at home.3.当当As作作“按照按照方式方式”,“像像”的解时，就是引导方式状语从句的解时，就是引导方式状语从句eg You should do everything as I do.4.作作“虽然、尽管虽然、尽管”解时，引导让步解时，引导让步状语从句。常用倒装语序状语从句。常用倒装语序,即即adj. /adv. / n.+ as +主语主语+谓语谓语+主句主句Child as he is, he knows a lot.5.As 引导比较状语从句，常见于引导比较状语从句，常见于“(not)as . as”

3、 “(not)so.as”,引导比较状语从句。引导比较状语从句。前一个前一个as是副词是副词,后一个后一个as是连词是连词They helped the old as much as possible.I dont speak English so/ as well as she does. 2.As 作关系代词引导定语从句作关系代词引导定语从句 限制性定语从句限制性定语从句 非限制性定语从句非限制性定语从句先行词一般有先行词一般有the same、 such 等词等词修饰。修饰。先行词一般是一个先行词一般是一个句子或短语句子或短语限制性定语从句限制性定语从句 :Such a good fil

4、m as you described is well worth seeing.非限制性定语从句非限制性定语从句:She is late, as is often the case.1.As is well-known, Taiwan belongs to China.另外，在非限定定语从句中，谓语动词另外，在非限定定语从句中，谓语动词是是be said ,be known , be expected ， be announced ，必须用，必须用as 引导。引导。2.As is known to everybody, the moon travels round the earth once every monthAs作介词时，引导的介词短语大多用作状语As a League member, Ill take the lead in everything. They have me as one of their own children.（宾补）so as to 为的是，以便so.as to 如此以至于as much 同样的as blind as a bat