Inside: These free editable sub binder forms are perfect for elementary teachers! Taking a day off as a teacher is stressful when you wait to plan until the last minute! Not only do you have to worry about plans while you are away, but you may also worry about how the day will go while you’re gone. You want the day to run as smoothly as possible, right? This is why it’s a great idea to not only have emergency sub plans on hand, but also a substitute binder.