whom 与them 的区别在各种从句中的（定语,名词性从句?

Question

whom 与them 的区别
在各种从句中的（定语,名词性从句?

Answer 1

whom是用在定语从句中,做介词的宾语,指人.而them是用在并列句中.
如：
He has many friends,most of whom are Chinese.这句是定语从句.
He has many friends,and most of them are Chinese.或He has many friends.Most of them are Chinese.这两句是并列关系.