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从句担任状语，在句子中修饰谓语(或其他动词)、形容词、副词或是整个句子，它常用来表示时间、地点、原因、目的、结果、条件、方式、比较、让步等。 复习状语从句要掌握如下几点： 1．全面掌握状语从句的九大类别，熟悉引导它们的不同连接词的意义和用法。 2．准确判断主从句的逻辑关系，同时还要注意区分词义相近的易混词的辨析，如：as, when, while, since, because, for等。 3．应用状语从句的过程中要注意主从句时态、语气的统一，掌握状语从句的省略形式。 4．与其他从句、句型结合起来分析、辨析。 一、时间状语从句 常见的从属连词有：(注意其汉语意义) when, while, as, before, after, since, until (till), once, as soon as, the moment, the minute, immediately, directly, each/every time, the first time, the last time, next time, by the time等。 While we were chatting, she was looking at the time table on the wall. Sometimes I watch TV as I am having breakfast. Every/Each time I was in trouble, he would come to my help. No sooner had I gone to bed than I fell alseep. 二、原因状语从句 常见的从属连词有：as(由于)，because(因为)，since(既然)，now (that)(既然)，considering that(顾及到)，seeing that(由于)等。 | 
