（一）which是關(guān)系代詞,其指代的先行詞是物,which在從句中作主語或賓語,在從句中充當(dāng)賓語時(shí)可以省略.which可以換成that.如：
This is the desk which/that/-- I bought yesterday.這是我昨天買的桌子.（which/that/-- I bought yesterday是定語從句.which/that在從句中作賓語,可省略）
The books which/that are on the desk are mine.桌子上的書是我的.（which/that are on the desk是定語從句,which/that 在從句中作主語,不能省略.）
（二）where是關(guān)系副詞,其指代的先行詞是地點(diǎn)名詞,where在從句中作地點(diǎn)狀語.如：
This is the house where I grew up.這就是我在此長大的房子.（where I grew up是定語從句）
（三）in which是介詞加關(guān)系代詞.in which有兩種用法：一是替換關(guān)系副詞where,一是替換指代the way的關(guān)系副詞that.如：
This is the house in which I grew up.（in which I grew up是定語從句）
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 是定語從句）