英语连词的用法As一As 用作连词的用法:1. as用作连词引导时间状语从句 as与when,while都是引导时间状语从句的从属连词,含义都是当的时候。但它们有区别:用when时,从句的动作可以与主句的动作同时发生,也可以先于主句的动作发生;用while时,从句的动作为一过程,主句动作与从句动作同时进行或在从句动作过程中发生;用as时,主句和从句的动作同时发生,具有延续的含义。例如: (1)It was snowing when he arrived at the construction site.他到达工地时,天正在下雪。 (2)He was watching TV while his mother was cooking.他母亲做饭时他在看电视。 (3) You will grow wiser as you grow older.你会随着年龄的增长而越来越聪明。when作当的时候解,可以指较短的(一点)时间,也可指一段时间。如: When he was at college, he could speak several