It's one's turn to do sth.中的turn有根据one's的单复数变化而变化么?

问题描述:

It's one's turn to do sth.中的turn有根据one's的单复数变化而变化么?
就是如果one's 是their的时候 turn要变为复数么?

不用
It's their turn to use the games room.
It's our turn to play.