定语从句~~~~！！！？？

说白了，关系副词像where/when，就相当于 介词+which
例:This is the house where I live.
===This is the house which I live in.

通俗讲，或者说可以这样理解，用关系代词的从句句子一定缺主语或宾语，用关系副词的句子不少成分，只缺少诸如原因、地点等用来补充，使句子表达更加清晰的词或短语。The watch which was lost has been found. 从句__was lost就缺主语。 I will never forget the mountain village where I spent my childhood.从句I spent my childhood句子成分完整，where从句表地点，修饰village（注意区分定于从句与地点状语从句）I will never forget the mountain village which I spent my childhood in.从句I spent my childhood in__.缺少介词宾语。通常将in提前，用I will never forget the mountain village in which I spent my childhood in.