含有介词的定语从句,定语从句中的关系副词(2)

This is a place where he works.这是他工作的地点。

This is the house which I live in now.= This is the house where I live now.(where是副词) （3）why 指原因，其先行词是原因reason，

起原因状语作用。例如：

Nobody knows the reason why he is often late for school. 没人知道他为什么上学总迟到。