they作为代词，含义为他/她/它们，指性别不详的人，用以代替he或she；them意为他们，用以代替him或her；their意为他/她/它们的，用以代替his或her。

一、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。在句中作主语，放在开头。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 now say that red wine is good for you.现在专家说喝红葡萄酒对人有好处。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。

二、them的含义及用法them作为代词，含义有他们;她们;它们;指性别不详的人时，用以代替him或her。在句中作宾语，跟在谓语之后，常放在句子末尾。例句：Tell them the news.把这消息告诉他们。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。It takes great courage to face your child and tell them the truth.面对自己的孩子，告诉他们真相是需要很大勇气的。I can probably make the time to see them.我大概能腾出时间去看望他们。I'm not going to let them get one over on me!我决不让他们胜过我！三、their的含义及用法their作为they的形容词性物主代词，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。Make sure you get a good look at their faces.你一定要仔细看清他们的面孔。Within three days they had exhausted their supply of food.他们在三天之内就把所有粮食吃光了。