The short story Ms. Awful is about a super loose teacher. Her class messes around a lot but she doesn’t correct them. One day they have a substitute. Their substitute is super strict and basically the opposite of the old teacher. The kids find out that it was actually their old teacher dressed up and everyone gets very angry but later forgive her.
I think the theme of this short story is to not take things for granted. The kids had a nice teacher but they abused this privilege and messed around. The reason she became more strict is because the children need to become more thankful.