their的主格是they。their作为限定词，中文含义有“他们的”、“她们的”、“它们的”，可以在提及性别不详的人时，用以代替his或her；they作为代词，意思有“他们”、“她们”、“它们”、“人们”等。
扩展资料
例句有：
1、Their parties are always fun.
他们的聚会总是乐趣横生。
2、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。
3、They both had some right on their side.
他们双方都有一定的'道理。
4、They worked hard to give their children a good start in life.
他们力争为孩子们奠定一个良好的基础。
5、People often share their political views with their parents.
人常常跟自己的父母政治观点一致。
