【归纳拓展】 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,即非延续性动词。 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,即延续性动词。强调主句谓语动词与从句谓语动词同时发生。 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个动作交替进行,指“一边……,一边……”。 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……”。 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.后接名词表示某一年龄段时,用as。 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。 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。 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。 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。 Tired as they were,they walked on.Child as he is,he knows a lot.(child前不用冠词) as作关系代词 (1)引导非限制性定语从句,作“正如”“这一点”解。 He is very careful,as his work shows. As is wellknown,Taiwan belongs to China. as的这种用法,请看下面的高考题: ________ is known to everybody,the moon travels round the earth once every month. A.It
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