主格：I,you,she,he,we,it 宾格:me,you,her,him,us,it
形容词形物主代词：my,your,her,his,our,its
名词性物主代词：mine,yours,hers,his,ours,its
主格和宾格的区别：主格在句子中做主语,宾格在句子中做宾语
e.g.She is crying because of you.
形容词形物主代词和名词性物主代词的用法区别是：前者在句中做定语,后者在句中做主语或者宾语
e.g.She is our friend.