when和while的用法区别 口诀
when和while的区别如下：1、从句中用法区别：
while引导的从句只能用延续性动词，而when引导的从句可以用延续性动词也可以用非延续性动词。
2、从句时态的区别：
when引导的从句动作和主句动作可以同时发生或在之后发生，while只能同时发生或存在。
3、具体含义的区别：
when是既指时间点，也可指一段时间，while是during the time that，只指一段时间。
扩展资料：
时间状语从句：
由when，while引导，用表示时间的连词连接一个句子作状语，这样的主从复合句就是时间状语从句。
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。
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