they和their的用法和区别：their是所有格（物主代词），意思是他们的。they通常作为主语，意思是他们。their（他它她们的）是they的形容词性物主代词，后面加名词。they（他它她），是代词，作主语。

they的例句：The two men were far more alike than they would ever admit（那两个人也许不承认，可他们非常相像）；their的例句：But anyone looking for income from their investments is in a much worse state（但是，那些指望靠投资获取收入的人境况更为糟糕）。