when前后时态用法是什么？
由when引导的时间状语从句，主句用过去进行时，从句应用一般过去时。
1、when可指时间点，又可指时间段，从句中可用延续性动词，也可用非延续性动词。
2、表示主句的动作发生在从句的较长动作过程中，when, as均可使用。从句中为be动词时，多用when。
3、when是at or during the time that，既指时间点，也可指一段时间。
4、when 说明从句的动作和主句的动作可以是同时发生，也可以是先后发生。
扩展资料：
1、回答 when 引导的从句，不一定指出具体的时间点。如回答句可用 tomorrow， next month 等。而回答 what time 引导的问句，则必须说出具全的时间点，如 at two o'clock， at five past ten 等。
2、由 when 等引导的状语从句，如果主语与主句的主语一致或是 it ，谓语动词又含 be 动词时，主语和 be 动词常常被省略，就变成“ when + V-ing/ V-ed/ adj/ 介词词组”的结构。
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