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状语从句 所谓状语从句，是指用来说明主句行为发生的时间、原因、条件、地点、目的、结果及方式等。 1) 时间状语从句：记住以下连接词的意思和重点： when / while / as 注意：while除了做时间状语的连接词外，还解释为虽然，而. 例如：He is very diligent, while she is very lazy. before 在之前 until / not until注意：not until放在句首时，往往要求倒装 as soon as / once immediately / instantly / directly 原本是副词，这里作连接词，表示一就， 例如： I knew I had made a mistake directly I had done it. | 
