.状语从句状语从句时间状语从句地点状语从句原因状语从句目的状语从句结果状语从句条件状语从句方式状语从句让步状语从句比较状语从句.1. 时间状语从句1) 由连词when, while, as, as soon as, before, after, since, till/ until等引导。 主句用将来时，从句常用一般现在时表将来I will tell him when he comes back.2)while, when, as 辨析While 引导的时间状语从句只指一段时间，强调某一段时间内，主从句动作同时发生。从句动词常是延续性的 When 既可以指一个时间点, 也可以是一段时间，可表示主从句的动作同时或先后发生。从句动词可以是延续性的，也可以是非延续性的。As 强调主句从句动作相并发生, 译为”一边一边”.When he returned , his wife was cooking.While he was reading, his wife was cooking.He hurried home, looking behind as he went .对比训练1_hehea
