大概有以下五个要点吧：

要点一：关系代词whose在定语从句中作定语。

He’s a man whose opinion I respect. 他是我尊重其意见的人。

That’s the man whose house has burned down. 就是那个男人的房子被烧毁了。

要点二：关系代词whose既可指人也可以指物。如：

This is the house whose windows were broken. 这就是窗户被打破了的房子。

It’s the house whose door is painted red. 这就是那所门户涂成红色的房子。

要点三：关系代词whose既可引导限制性定语从句，也可以引导非限制性定语从句。

The ship, whose engine had failed, is now safely under tow.  引擎坏了的船正被安全地拖着。（非限制性，指物）

This is an SOS for a Mr Tucker, whose mother is seriously ill. 紧急寻找塔克先生，他的母亲病重。（非限制性，指人）

要点四：关系代词whose前面有时（如果语义需要的话）可以连用介词。如：

He is the man from whose house the pictures were stolen. 他就是那个家里藏画被盗的人。

Michel Croz, with whose help Whymper climbed the Matterhorn, was one of the first professional guides.  米歇尔·克罗兹是第一批职业向导之一，在他的帮助下温珀攀登了马特峰。

要点五：关系代词whose在语义上相当于…of which / of whom。但具体使用时，指物时，whose有时可以用 of which来改写。如：

He’s written a book whose name I’ve forgotten.

= He’s written a book the name of which I’ve forgotten.

他写了一本书，书名我忘了。

但whose指人时，通常不能用含有of whom的结构来改写，如：

他就是汽车被窃的人。

误：He is the man the car of whom was stolen.

正：He is the man whose car was stolen.