1. You can / must raise your hand and wait before you ask a question. 2. In the old days, teachers could / should hit students with a ruler if they misbehaved in class. 3. In certain schools, students may / must stand when their teacher enters the room. 4. Steven wants to go out but his mum said he needn’t / can’t go until he has finished his homework. 5. We need / mustn’t to decide who will be class president. 6. I didn’t see Bill today, he should / must have taken the day off. 7. Kate looked pale in the doctor’s office. She may / might be ill. 8. In Britain, all teens have to / may stay in school until they are 16 years of age. 9. You should / might spend time studying if you want to get good marks. 10. “Can / May I leave early today, please?” Sarah asked.