班级公约英文怎么写12条 Don't ...Please？

班级公约
Class Convention

Don't spit in public.Don't litter in classroom. Don't be late for class.Don't talk loudly in class. Don't play a trick on others!Don't forget to turn off the lights after school. Don't interrupt when the teacher is talking. Don't pretend to know the answer when you actually know nothing. Don't copy classmates' homework. don't cheat in any exam. don't play fire in the classroom. Don't buy and eat junk food at school.追答

please keep quiet!
please don't be late for class.
please speak as loudly as you can.