这是根据句子成分来区别的. 人称代词分主格和宾格,用作主语时用主格,作宾语是用宾格. 主格:I,you,he,she,it,we,they 宾格:me,you,him,her,it,us,them 【I am a teacher.My mother love me.】 物主代词分形容词性和名词性,用作定语起修饰和限定作用时用形容词性,用作主语或宾语是用名词性. 形容词性:my,your,his,her,its,our,their 名词性:mine,yours,his,hers,its,ours,theirs 【This is my book.The book is mine.】