their的名词性物主代词是：theirs
My trouble is nothing to theirs .我的困难比起他们来算不了什么。
Theirs is the largest house on the block .他们的住宅是该街区最大的住宅。
I will do my part if everybody else will do theirs .要是大家都做那我也做。
Our concern and theirs substantially overlap .我们的利害关系和他们的大致相合。
That 's not the custom of theirs .那不是他们的习俗。
Our team triumphed over theirs .我们队胜了他们队。
I have my book ， does each student have theirs ?我已有书本了，是不是每位同学都有了
Are you a friend of theirs你是他们的朋友吗
My value for domestic tranquility should much exceed theirs .我应该远比他们重视家庭的平静生活。
His position at the business was less enviable than theirs .他在公司的地位还不如他们的更令人艳羡的。
Gibbon， however， is of opinion that theirswas a valid marriage .但是，据吉本看来，这二人的婚姻是经过正当手续的。
She took up her abode in theirs for every hour that might be spent in their service .为了随时给他们帮忙，她搬到他们家里来住。
The truth is that when mistakes occur ， they are more likely to be ours than theirs.其实，一旦有误，与其说错在他们，勿宁说错在我们。
If some countries refuse to cut their consumption， others must reduce theirs .如果某些国家不愿意降低消费，那么其他国家必须降低他们的消费。
Despicable as the fat restaurant detective was， his crime was less than theirs .虽然那个饭店的胖侦探长行为卑劣，但他所犯的罪却要比他们的轻一些。
their的名词性物主代词是什么
their名词性物主代词是theirs。
比如
These books are theirs.
这些书是他何的。
their是形容词性物主代词。因为their不能单独使用，你需要在后面跟另一个名词。如
Their father Is a teacher.
他们的爸爸是名老师。
分辨名词性物主代词还是形容词性物主代词的依据是看该物主代词是可以独立使用还是需要用来修饰另一个名词。名词不能用来修饰名词，而形容词可以。
