这就是名词性物主代词和形容词性物主代词的区别。yours 等于your 加一个名词。mine 等于my +一个名词。谢谢采纳，不懂再问
MY 的后边可加形容词或名词
where is my hat?
my dear fellow
mine 通常单独表一个意思 不加任何词
i think that book is mine.
He is a friend of mine ,ie one of my friends.
Is this your bike? Yes it is mine.这个等同于Yes，it is my bike. mine就等于my+东西。
your 和yours同解。
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