where 前面能用介词吗?

问题描述:

where 前面能用介词吗?
请教两个英语句子,china is the birth place of knites,from where kiteflying spread to Japan ; she stood near the window,from where she saw the national flag being raised.
我知道在定语从句中where 就等于介词加which,where 前面是不能有介词的,那么上面两个句字是什么从句呢?该如何分析呢?介词后面怎么加了where呀?

你的两个句子都对,都是非限制性定语从句from 后接副词或介词短语作宾语的例子很多He came out from behind the door.他从门后面出来I saw my boy sleeping in class from outside the window我从窗外面看到我儿子在...