摘要：3．as ①as表示点时间时.从句中用短暂性动词,表示段时间时.用持续性动词.as和when两者经常可以通用. The thief was caught as when he was stealing in the supermarket. 小偷在超市行窃时被逮住了. I saw Jim as when he left the meeting room. 吉姆离开会议室时候我看到了他. ②as表示 一边--一边--.强调从句和主句中两个动作交替进行或同步进行. They talked as they walked. 他们边走边聊. He looked behind from time to time as he went. 他一边走.一边不时地往后看. ③as表示随着 As time goes on, it's getting warmer and warmer. 随着时间的推移.天气变得越来越暖了. As spring warms the earth, al flowers begin to bloom. 随着春回大地.百花开始绽放. 4．when, while, as的用法区别 ①只有当从句表示的是段时间.即其谓语动词有持续性特征时.这三者可以通用互换. I got the news on the radio when while as I was having breakfast. 我在吃早饭的时候从收音机里获悉这一消息. ②在下列情况下.三者彼此之间不能替换使用: a．as更强调同一时间或紧接的一前一后或伴随着的变化. We listened to the singer sing as he played the guitar. 我们听着歌星边弹吉它边演唱. I thought of it just as you opened your mouth. 你一张嘴我就知道你要说什幺 As he grew older, he became less and less active. 随着他年龄的增长.他变得越来越不活泼了. 提示: 状语从句可放在主句之前或之后.放在主句之前时一般用逗号与主句分开.有时可置于主句中间.前后用逗号. b．when更强调特定时间.还可表示从句中的动作先于或后于主句的动作. When I had given Mary the spare ticket, I found my own already gone. 当我把多余的票给了玛丽时.我才发现我自己的票已不知去向.(从句动作发生在主句之前.注意主从句的时态) When I finally got there, he meeting had been on for ten minutes. 当我最终赶到那里时.会议已开始十分钟了.(从句动作发生在主句之后.注意时态) c．while从句只能表示延续的动作或状态或主从句中动作的对比. She thought I was talking about her daughter, while in fact, I was talking about my daughter. 她以为我在谈论她女儿.而事实上.我在谈论我的女儿. d．若表示两个短促动作几乎同时发生时.用as场合多于when. As he finished his speech, the audience burst into applause. 他结束讲话时.观众爆发出雷鸣般的掌声.

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