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.
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