1) puplis must/ mustn't obey the teacher. 2) puplis need/ needn't use the internet at their it lessons. 3) puplis have to/mustn't use someone else's book or gym locker, or allow them to use yours. 4) mobile phones needn't/ must be turned off during regular school hours. 5)students needn't/ mustn't have the following items at school: knives, weapons, dangerous objects, tobacco, drugs, alcohol and gang emblems. 6) you have to/ needn't take off your hats and coats when you enter your classroom.