引导时间状语从句.作“当--的时候 解.有“随着-- 之意.与while意义相近.强调两个动作同时发生,或某事一发生.另一事立即发生.e.g.: He shouted aloud as her ran along. 他一边往前跑.一边高声地呼喊. I was startled as he opened the door. 他一开门.吓了我一跳. as作连词.相当于when.e.g.: As a little boy (When he was a little boy)he began to learn to play piano. 他小时候就开始学弹钢琴. 【
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