adj.他们的；她们的；它们的

Children depend on their parents for food and clothing. 小孩依赖他们的父母供给衣食。

Young mothers are gushing over their babies. 年轻的母亲滔滔不绝地谈论她们的婴儿。

We have no idea how the birds find their way. 我们不知道这些鸟如何找到它们的路。

their是复数第三人称的所有格形式,是复数形容词性物主代词,在句中只可用作定语,其后常接复数名词。有时为了避免显示性别, their还可代替his, her用作anybody, anyone, everyone等词的物主代词,此时其后可接单数名词。有时their还可用作动名词的逻辑主语。

their还可与own连用构成强调。