their造句：
Janis and Kurt have announced their engagement//www.souquanme.com
贾尼斯和库尔特已宣布订婚。
theirs造句：
here was a big group of a dozen people at the table next to theirs
他们旁搜趣网边的桌上坐了一大群人，有十几个。

These are their computers.
These computers are theirs.赞同1| 评论

The city is famous for its silk. 该市以出产丝绸而闻名于世 These are our pictures, theirs are on the wall.这些是我们的图片，他们的在墙上

These are their books.
These books are theirs.
theirs 是名词性物主代词，本身就是名词，指他们的东西

Are these book blong to us?
No,they are theirs.
He said that these books are theirs.