Letter of apology to the Principal of your school expressing your regret for misbehaviour

Madam,

I am really verjrscnTy to have misbehaved with my Science teacher in the class. When she was teaching us an experiment, I kept myself busy in drawing something. She caught me in the act and made me stand on the bench. Now I think I should not have behaved like this. I regret and promise to be a very nice student.

Yours obediently,