they的形容词性物主形式

they的形容词性物主代词是their；

their

det.他们的;她们的;它们的;在提及性别不详的人时，用以代替his或her；

they

pron.他们;她们;它们;用以代替he或she，指性别不详的人;(泛指)人们，人人，众人

It was time to put their suggestion into practice.

那时就该把他们的建议付诸实施了。

This course is designed so that students can progress at their ownspeed.

这门课的设计思路是让学生自己掌握进度。

The loss of their son brought the two of them together.

丧子使他们两人重归于好。

Having a child gave new meaning to their lives.

有了一个孩子使得他们的生活有了新的方向。