when的用法五种句型是什么?
如下：
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。
5、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。
相关词语解释：
when可以引导多种从句或特殊疑问句。根据不同的语境，它既可以放在句首也可以放在句中。
读音：英 [wen]，美 [wen]。
释义：什么时候，何时，什么情况下。
语法：when的基本意思是“什么时候”。可用作疑问副词，用来询问某事曾发生或将要发生的时间，引导特殊疑问句，还可用作关系副词引导限制性定语从句、非限制性定语从句和表语从句，表示“是…时候的事”。
例句：
I asked him when he'd be back to pick me up.
我问他什么时候回来接我。
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