i know the place where you live
或者 i know the place in which you live.
我知道你住的那个地方.这是定语从句,where=介词+which.既然是place,那就是in the place.所以一互换,我说的这两个用法都行.
注意：外国人不习惯说the place which you live in.他们习惯把介词和指代词放一起!