she( didn't know ) when or where to hold the meetingshe( didn't know ) when or where to hold the meeting ,so she went to ask jer teacher.为什么不用had't know 不是过去的过去么

she( didn't know ) when or where to hold the meetingshe( didn't know ) when or where to hold the meeting ,so she went to ask jer teacher.为什么不用had't know 不是过去的过去么
she( didn't know ) when or where to hold the meeting
she( didn't know ) when or where to hold the meeting ,so she went to ask jer teacher.
为什么不用had't know 不是过去的过去么

she( didn't know ) when or where to hold the meetingshe( didn't know ) when or where to hold the meeting ,so she went to ask jer teacher.为什么不用had't know 不是过去的过去么
know没有时间段的概念,知道/不知道不能用时间来修饰,所以没有什么完成时说的.hadn't known本来就是错的.know、feel、think等属于动词,但是不表示实际发生的动作.
如果是She had finished her homework, then she went shopping. 表示两个动作发生的顺序可以用过去完成时.

had done(即过去完成时），只能依附于一个过去完成时的时间状语，常用by the time
by the end of 等

比如说，这件事情发生在昨天，she 不知道，那就必须是she didn't know------ .不能用she hadn't known. 她昨天的不知道不是过去的过去，而是过去-----yesterday,所以只能用一般过去时---didn't know.