Do you know when we are going to have our final exam?

你知道我们什么时候期末考试吗?

It will begin on January 10th.

一月十日开始。

So we don't have much time on our hands.

所以，我们没有很多时间了。

Yes, that's just what I was worrying about.

是的，那正是我所担心的。

on hand 现有的，尤指帮助

on one's hands 由某人负责

out of hand 难以控制

out of one's hands 不再由某人负责