一个英语学习问题

Question

名词性物主代词作主语时,谓语动词的单、复数形式取决于它所替代的名词的数，这句话怎么理解？我有点看不懂。。所以请教下各位。。最好有能举几个例子说明下。。

Answer 1

是说代词所指代的名词可能是复数，也可能是单数。 看个例子就明白了：
I've made some dumplings, but yours look better.

yours指代复数形式的dumplings, 所以并列句的谓语动词用look

I've made one dumpling, but yours looks better.
yours指代单数dumpling, 因此并列句的谓语动词用looks

Answer 2

This is my book. Yours is over there.这是我的书，你的在那里。
These are my books. Yours are over there. 这些是你的书，你的在那里。