this isn't ____ball,It's is under the chair.A.mine;he;My B.my;his;my C.his;her;hisD.her;his;hers.
This is your pen. His is over there.
分析：后接名词pen，用形容词性物主代词，故排除C；作主语用名词性物主代词，再排除A与B。His名词性物主代词与形容词性物主代词一样。
物主代词有形容词性（my，your，our，their，his等）和名词性（mine，yours，hers，Ben's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.
扩展资料
名词性物主代词的句法功能
1、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。
2、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。
3、作介词宾语
例如：You 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。
4、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。
名词性物主代词可以用在介词of的后面，相当于“of+名词所有格”。
d. his
这里要用名词性物主代词
This isn't ( her ) ball. It is ( his ).( Hers ) is under the chair。
形容词性物主代词后接名词，名词性物主代词后不能接名词。
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