ex. drink in class --------- You mustn't drink in class!

be late for class ---------
be polite ---------
speak clearly ---------
talk during tests ---------
use your mobile phone ---------
eat in class ---------
pay attention ---------
open your books before lessons start ---------
miss lessons ---------
do your homework on time ---------
bring knives to school ---------
copy other students’ work ---------
smoke or chew gum in class ---------
phone the school when you're ill ---------
run or shout in the corridors ---------