好评回答

•     as可以作连词、介词及关系代词。现将其用法小结如下: 一、 as作连词的用法: 1。 作当……的时候,引导时间状语从句。注意与when、 while的用法区别。 ① when作当……的时候解,可以指较短的(一点)时间,也可指一段时间。
    如: When he was at college, he could speak several foreign languages。   When the clock struck twelve, all the lights in the street went out。
     ② 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。如: Work while you work。   Play while you play。
     ③ 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: The girl dances as she sings on the stage。
       He looked behind from time to time as he went forward。 B)表示两个同步发展的动作或行为,译为随着……。
    如: As time went on / by, she became more and more worried。   As children get older, they become more and more interested in the things around them。
     C)表示两个短促行为或事件几乎同时发生。如: I thought of it just as you opened your mouth。   Just as the flying worm hit her face, she gave a loud cry。
     D) 后接名词表示某一年龄段时,用as。如: As a young man, he was active in sports。 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 / Since you're not feeling well, you may stay at home。 As he wasn't ready in time, we went without him。
       3。 as=in the way that, 作像、按照……的方式解,引导方式状语从句。如: He speaks English as Americans do。
     Remember, you must do everything as I do。 4。   用于as。。。as。。。或not so/ 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: They helped the old man as often as possible。 I don't speak English so/ as well as he does。
       5。 作虽然、尽管解,引导让步状语从句。常用倒装语序,即adj。 /adv。 / n。+as +主语+谓语+主句。如: Tired as they were, they walked on。
     Child as he is, he knows a lot。   (child前不用冠词) 二、 as作关系代词,引导定语从句,作正如、这一点解。如: He is very careful, as his work shows。
     As is well-known, Taiwan belongs to China。 as的这种用法,请看2001年的高考题: is known to everybody, the moon travels round the earth once every month。
       A。 It B。 As C。 That D。 What (字母下划横线的为正确答案) 另外,当先行词被the same, such等词修饰时,常用as来引导定语从句。
    如: Such a clever boy as he can learn anything quickly。   I was reading the same book as he bought yesterday。
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  森*** 2018-04-07 19:17:13 0 评论