名词性物主代词的句法功能
a. 作主语
如： May I use your pen? Yours (=your pen) works better.
b. 作宾语
如：I love my motherland as much as you love yours (=your motherland).
我爱我的祖国就像你爱你的祖国一样深。
c. 作介词宾语
I am writing with your pen, not with mine(=my pen).
d. 作表语
如：My life is yours. Its yours. Its yours. 我的生命属于你，属于你，属于你。