This is the house where we lived

This is the house where we lived
This is the house where I lived (in) two years ago.
这里的in为什么不能加?
那This the teacher （from） whom we've learnt a lot.这里的from 可加是因为learn from 是一个固定搭配．
那live in不也是吗？为什么不能加in呢?
解答说关系代词和关系副词在从句中充当一个成分时不能重复，请问是如何判断的呢？