Underline the correct modal verb. 1. You can/must raise your hand and wait before you ask a question. 2. Steven wants to go out with his friends but his mum said he needn't/can't go until he has finished his homework. 3. In Britain, all teens have to/may stay in school until they are sixteen years of age. 4. In the old days, teachers could/should hit students with a ruler if they misbehaved in class. 5. You mustn't/don't have to do this homework assignment, but those who do will get extra credit. 6. You should/need to ask your teacher if you require extra help with your studies. 7. In certain schools, students may/must stand when their teacher enters the room. 8. You should/might spend more time studying if you want to get good marks.