① 用于表示同一个人的两种动作交替进行,指“一边……,一边……。例如:
The girl dances as she sings on the stage.那个女孩在舞台边唱歌边跳舞。
He looked behind from time to time as he went forward. 当他朝前走时,不时地向后看。
② 表示两个同步发展的动作或行为,译为“随着……。例如:
As time went on / by, she became more and more worried. 随着时间的流逝,她变得越来越焦虑。
As he grew older, he became more intelligent. 随着他年龄的增长,他变得更有才智了。
③ 表示两个短促行为或事件几乎同时发生。例如:
I thought of it just as you opened your mouth. 恰好在你开口时,我想到了它。
Just as the flying worm hit her face, she gave a loud cry. 恰巧在飞虫撞到她脸上时,她大哭起来。
2. 引导原因状语从句
as,because,since都可以表示因果关系,连接原因状语从句,含义是“因为,由于,但它们有区别:because表示的语气最强;as一般放在句首,语气较弱,较口语化;since常常用在书面语中,表示多为对方已知的、或稍加分析便可得知的原因,有时可译作“既然。例如:
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