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英语词法专题讲座十六：状语从句 一、引导词的选择： 1. 时间状语从句 1). 由when、while、as（当……时候）引导的时间状语从句。 When jack got home, his mother was cooking. 2). 由after/ before (在….之后/ 前)引导的时间状语从句。 The football match played after school was over. 3). 由as soon as (一…..就……)引导的时间状语从句。 I’ll ring you as soon as I reach Beijing. 4). 由not….until（直到…..才…..）引导的时间状语从句。 They didn’t stop until they finished the work. 2. 原因状语从句 由because、since、as（因为、既然、由于）引导的原因状语从句。 Since you have known about that, please tell us what to do. 3. 地点状语从句 由wherever（无论在哪儿）引导的地点状语从句。 Wherever he goes, he always brings his pet dog. 4. 目的状语从句 由so that (以便、为的是)引导目的状语从句。 He got up very early so that he could catch the early bus. 5. 条件状语从句 由if或unless 引导条件状语从句。 I won’t go to his party unless I am invited. | 
