when引导的时间状语从句的时态是什么？
1、由when引导的时间状语从句，主句用过去进行时，从句用一般过去时。如：
He didn’t tell me when we should meet again. 他没有告诉我什么时候我们能再见面。
When he was still a little boy,Jack London wrote some compositions which were praised by his teachers.杰克·伦敦还是小孩时，他写的一些作文就受到老师的赞赏。
2、while通常用在事情同时发生的情况，主句和从句都用过去进行时。如：
Mother was cooking the meal while i was doing my homework。我做作业时，妈妈正在做饭。
She got married while she was working as a waitress。她在饭店当服务生期间结婚了。
扩展资料：
1、主句是一般现在时，从句时态不变。
He says (that) he will leave a message on my desk.他说他将在我桌上留言。
They know (that) he is working hard.他们知道他在努力工作。
2、主句是一般过去时，从句为各种相应过去时态。
He answered that he was listening to me.他回答说他在听我说话。
3、主句是一般将来时，一般从句为一般现在时（“主将从现”）。
4、当从句所叙述的事实为一个定理或客观存在时，无论主句是什么时态，从句均用一般现在时。但与人有关的均不是定理。
He told me that he was a boy. 他告诉我他是个男孩。
（虽然性别是客观存在的，但“男”“女”也是人为定义的，故非第4种情况）
Father told me that practice makes perfect. 父亲告诉我，熟能生巧。
（所叙述的事实为一个定理，用一般现在时）
参考资料来源：百度百科-从句
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