摘要： as/ when/ while (1)as 是连词.意思是"当--的时候.一面--一面".(强调同时.一般连续时间不长).如: As we were talking about Titanic, our teacher came in. 正当我们谈论"泰坦尼克号"这部电影时.教师进来了. The students sing as they go along. 学生们边走边唱. (2)When和as一样都是连词.注意它们的不同.如when"当--的时候"(一般表示动作紧接着发生), "那时"(等立连词.前有逗号分开) I stayed till sunset, when it began to rain. 我一直呆到太阳下山.那时天开始下雨了. (3)while是"当--时候,和--同时"(强调同时发生.一般连续时间较长) While I was watching TV, he was reading. 当我在看电视的时候.他正在看书. While there is life, there is hope. 有生命就有希望.

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