1)物主代词既有表示所属的作用又有指代作用,例如:

     John had cut his finger; apparently there was a broken glass on his desk.

    约翰割破了手指,显而易见,他桌子上有个破玻璃杯。

    物主代词有形容词性(my, your等)和名词性(mine, yours等)两种,形容词性的物主代词属于限定词。

    名词性的物主代词在用法上相当于省略了中心名词的 --'s属格结构,例如:

     Jack's cap  意为   The cap is Jack's.

     His cap   意为   The cap is his.

   2) 名词性物主代词的句法功能

    a. 作主语,例如:

     May I use your pen? Yours works better.

     我可以用一用你的钢笔吗? 你的比我的好用。

    b. 作宾语,例如:

     I love my motherland as much as you love yours.

     我爱我的祖国就像你爱你的祖国一样深。 

    c. 作介词宾语,例如:

     Your should interpret what I said in my sense of the word, not in yours.

     你应当按我所用的词义去解释我说的话,而不能按你自己的意义去解释。

    d. 作主语补语,例如:

      The life I have is yours. It's yours. It's yours. 我的生命属于你,属于你,属于你。