Réponse :
1. You must respect others
2. You must wear the school uniform.
3. You must not (ou musn't) smoke.
4. You musn't eat/drink/chew in class.
5. You must write your homework in your diaru.
6. You must tun off your mobiles phones in school.
7. You musn't run in corridors.
explications :
"must" est une obligation sa negation est"musn't" ou "must not", c'est la même chose.