they形物为their，名物为theirs
例句
1、
Their family has always been well thought of around here.
他们家在这一带一直颇受敬重。
2、
It was time to put their suggestion into practice.
那时就该把他们的建议付诸实施了。
3、
This course is designed so that students can progress at their own speed.
这门课的设计思路是让学生自己掌握进度。
they的形物和名物
they 的形容词性物主代词是their ，是做定语，修饰名词，也就是说their的后面一定要有个名词而它的名词性物主代词是theirs，在句中充当主语、宾语、和表语，相当于“形容词性物主代词+名词”，因此，切记：theirs的后面是不能再跟名词！
例句：
① I like their dog very much，because it is so cute.我非常喜欢他们的狗，因为它是如此可爱。
（their 作定语，修饰dog）
② I don't like my bike.I like theirs.我不喜欢我的单车，我喜欢他们的单车。
（theirs 在句中作宾语，后面不能再接名词，它相当于“their bike”）
