时间状语从句用法
用法可以用八个字来概况：主将从现或主过从过。主将从现：主句用了将来时，从句就要用现在时。主过从过：主句用了过去时，从句也要用过去时。扩展资料
时间状语
在复合句中，担任状语成分的从句称为状语从句。时间状语从句说明主句动作发生或进行的时间。状语从句由连词引导，其位置通常可以放在句首或句末。放在句首时，常用逗号与主句分开；放在句末时，从句前面往往不加逗号。
引导的时间状语从句的主从复合句中，动作发生在先的用过去完成时，在后的用过去时。表示前面的叙述所没有提到过的信息。它总是对所描述的'事件予以引人注目的强调，意为“这时；突然”；当位于句末的分句具有引种用法时，大致有以下三种情况：
A.when分句前面的分句使用过去进行时。
B.when分句前面的分句使用 was （were） about to，was（were） on the point 等。
C.when分句之前的分句用过去完成时，其中 sb had hardly/scarcely/barely … when已成为固定词组。
表示对比，主要有以下两种情况：
A.相当于whereas，while，since，意为“既然；然而”。
B.when从句中使用虚拟语气，意为“本来……却……”。
原因状语
原因状语从句说明主句动作发生或进行的原因，一般由because,since,as等引导。because语气较强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或者已为人们所知，就用as 或since 。
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