if you don´t behave well in class, you´ll get points.
In order not to loose points in the following exam, you´ll have to give me a "pay me back"
1 point: Draw a picture of something related to the lesson.
2 points: Write 25 times "I must behave well in class"
3 points: Write 50 times "I must behave well in class"
4 points: Copy the lesson we´ve studied today.
5 or more points: Copy the whole unit.