定语从句中除了从句的谓语动词含有的介词不能动之外无论是主句的介词还是从句的介词都能提到介词之前是吗?
比如Along the wall stand several bookshelves on which are all kinds of books.这里的on是stand on中的
In the bag he found a piece of paper on which were written some special words.这里的on 是write on中的