their和they和them的区别：含义不同、用法不同。their作为形容词，含义为他们的、它们的、在提及性别不详的人时，用以代替his或her；they作为代词，含义为它/他/她们、人们；them作为代词，含义为她们。
一、their的含义及用法
their作为形容词，意为他们的;她们的;它们的;在提及性别不详的人时，用以代替his或her。
例句：Their parties are always fun.
他们的聚会总是乐趣横生。
If anyone calls, ask for their number so I can call them back.
如有人打电话来，问问电话号码，这样我可以回电话。
Janis and Kurt have announced their engagement...
贾尼斯和库尔特已宣布订婚。
It was time to put their suggestion into practice.
那时就该把他们的建议付诸实施了。
The loss of their son brought the two of them together.
丧子使他们两人重归于好。
二、they的含义及用法
they作为代词，意为他们;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。
例句：If anyone arrives late they'll have to wait outside.
谁要是迟到，他就得在外面等着。
The rest, as they say, is history.
其余的就尽人皆知，不须赘述了。
They cut my water off.
管事的把水给我掐了。
They now say that red wine is good for you.
现在专家说喝红葡萄酒对人有好处。
三、them的含义及用法
them作为代词，意为他们;她们;它们;指性别不详的人时，用以代替him或her。
例句：Tell them the news.
把这消息告诉他们。
Did you eat all of them?
你都吃光了吗？
If anyone comes in before I get back, ask them to wait.
如果在我回来之前有人来，就请他等一等。
