Don't talk nonsense, because when the headmaster speaks, all he writes is nonsense. You are all pediatricians. Don't write too long, or the headmaster will get bored. . Specifically, it is like: a good class teacher and a happy learning atmosphere are our greatest motivation for learning. During the time when Teacher XXX was the head teacher, we had a good time and studied hard, so we hope you can allow us to continue to be together, preferably with the signature of your class, and find some representatives to send the letter to the principal. Of course, the headmaster won't refuse if you students go. Besides, this kind of joint petition has never been written before, and the principal will definitely agree to it when he is surprised and moved.