定语从句里whose 、of which、of whom 的用法whose在什么情况下可以被of which、of whom 所替换of which、of whom 在定语从句中作什么成分,有什么固定的形式吗

whose、of which和of whom都是定语从句中的引导词
of which 指物，of whom 指人，而whose既可指物又可指人 。所以指物的时候，可以用whose也可以用of which 代替；指人的时候可以用whose，当然可以用of whom 代替。
其实whose、of which和of whom的使用比较特殊，成分不是简单地主语宾语表语等，而是这个语中的一个名词所属。（就成分而言，和常规的只用which， who，whom或that 略有区别，因为常规的which， who，whom或that 可以较明确的指明它们在从句中的成分。比如 this is the book which i bought yesterday. which 做从句的宾语）
而且写出来，多是非限定性定语从句，即加一个“，”。
of whom ：I knew Li Ming, whose uncle is a teacher.
I knew Li MIng, the uncle of whom is a teacher.
源自 两个简单句或一个并列句
I knew Li Ming. His uncle is a teacher.
I knew Li Ming and his uncle is a teacher.

of which I saw the montain, whose top was covered with snow.
I saw the mountain, the top of which was covered with snow.
同样源自 两个简单句或一个并列句
I saw the mountain. The top of mountain was covered with snow.
I saw the mountain. and the top of it was covered with snow.
或I saw the mountain. and its top was covered by snow.

whose、of which和of whom都是定语从句中的引导词
of which 指物,of whom 指人,而whose既可指物又可指人 .所以指物的时候,可以用whose也可以用of which 代替；指人的时候可以用whose,当然可以用of whom 代替.
其实whose、of which和of whom的使用比较特殊,成分不是简单地主语宾语表语等,而是这个语中的一个名词所属.（就成分而言,和常规的只用which,who,whom或that 略有区别,因为常规的which,who,whom或that 可以较明确的指明它们在从句中的成分.比如 this is the book which i bought yesterday.which 做从句的宾语）
而且写出来,多是非限定性定语从句,即加一个“,”.
of whom ：I knew Li Ming,whose uncle is a teacher.
I knew Li MIng,the uncle of whom is a teacher.
源自 两个简单句或一个并列句
I knew Li Ming.His uncle is a teacher.
I knew Li Ming and his uncle is a teacher.
of which I saw the montain,whose top was covered with snow.
I saw the mountain,the top of which was covered with snow.
同样源自 两个简单句或一个并列句
I saw the mountain.The top of mountain was covered with snow.
I saw the mountain.and the top of it was covered with snow.
或I saw the mountain.and its top was covered by snow.