定语从句?whose the +n为什么等于the +n of which

定语从句,简单一点的理解,可以理解成,一个句子（从句）作定语使用,whose 在这里用作关系代词.whose (the未必一定用)+n意思 等同于,你应该理解,就是谁的（某某的）.,the +n of which（这里未必一定用which,如果是人就要用whom) 就是谁的.,所以,两个是可以相互替换的
举个例子
The school whose gate is toward east is biggest one in the city
The school is biggest one in the city,the gate of which is toward east.
I met Tom in the street whose brother is a doctor
I met Tom in the streeet,the brother of whom is a doctor
whose brother 可以用 the brother of whom

whose +n是 物主代词 作定语
the +n of which 是介词短语作定语
如the house whose windows....
=the house the windows of which ....
=the house of which the windows....

不对，应该是：
whose + n. = the + n. + which
如： He bought a house whose windows were broken.
=He bought a house, the windows of which were broken.
道理很简单，你想一下： the windows of the house = whose house