状语从句在复合句中作状语，修饰动词、形容词或副词等。状语从句可以表示时间、条件、原因、地点、目的、结果、让步、方式、比较等意义。
知识梳理：提纲挈领，抓住重点和难点！
各类状语从句连接词（短语）一览表：
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时间
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when, while, as, as soon as, since, until, after, before
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条件
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If, unless
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原因
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As, because, since
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地点
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Where
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目的
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So that, in order that
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结果
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So that, so…that, such…that
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让步
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though, although, even if, however
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方式
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As
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比较
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than, (not)as…as,
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