啊哈,有问题是好事啊,定语从句的确是起修饰作用,但所谓的做主语或宾语指的是关系代词who在从句中的成分.单看从句who studied with me,who指的就是the man吧,the man studied with me,这里的the man就是主语吧,而在定于从句中由who来指代,即who做主语；同理后一句,who you want to see即you want to see who,see the man,做see的宾语
希望能懂哈