Question

定语从句中 which where in which这三者怎么用

Answer 1

（一）which是关系代词，其指代的先行词是物，which在从句中作主语或宾语，在从句中充当宾语时可以省略。which可以换成that。如：
This is the desk which/that/-- I bought yesterday. 这是我昨天买的桌子。（which/that/-- I bought yesterday是定语从句。which/that在从句中作宾语，可省略）
The books which/that are on the desk are mine.桌子上的书是我的。（which/that are on the desk是定语从句，which/that 在从句中作主语，不能省略。）

（二）where是关系副词，其指代的先行词是地点名词，where在从句中作地点状语。如：
This is the house where I grew up.这就是我在此长大的房子。（where I grew up是定语从句）

（三）in which是介词加关系代词。in which有两种用法：一是替换关系副词where，一是替换指代the way的关系副词that。如：
This is the house in which I grew up.（in which I grew up是定语从句）
The way that/ in which she looks at you is strange. 她看你的方式怪怪的。（that/ in which she looks at you 是定语从句）

Answer 2

which 用来指物或指代前面整个句子，用在限制性定语从句中
in which 用来指物或指代前面整个句子，用在非限制性定语从句中
where 用来表示地点，引来引导地点状语从句或是在定语从中，当其先行词为地点时，用where引导定语从句。