英语问题.急急急!!!!!!!!!!!!

won't until

won't ,until

They will leave after their teacher comes back(不是bank).
他们老师回来后他们才会离开。
They won't leave until their teacher comes back.
他们不会在老师回来之前离开的。

don't,until

comes决定主句是将来时所以是 won’t until