he she it they I we you 是主格，在句子中只能做主语。he's=he is she's= she is和you are they are I am we are 一样是主语加系动词be.
your his her its my our their 是形容词性物主代词，相当于形容词，在句子中不能单独使用，其后必须加一个名词才完整。而加上名词后，就相当于名词性物主代词。
yours mine his hers its ours theirs 是名词性物主代词，等于名词的用法。因它等于形容词性物主代词加上名词。本身含有名词，所以make my mind 不能说成make mine mind.
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