你所说的并非都是人称代词：I,we,you,he,she,it,they等都是人称代词的主格,意思上没有“的” 字,在句子中作主语用.例如：
He is a worker.
I'm a teacher.
my,our,your,his,her,its,their等都是形容词性物主代词,意思上都有个“的”字.他们的后面都必须接个名词,即必须用来修饰名词,作定语用.
I saw his uncle.