1 You mustn’t / shouldn’t drive fast here – there’s a speed limit! 2 There’s a good train service to the city, so we mustn’t / don’t have to drive there. 3 You ought / should to go to the doctor about your sore leg. 4 In England, drivers have to / should drive on the left. 5 You shouldn’t / don’t have to pack lots of heavy things in your bag. 6 It’s my grandma’s birthday today, so I must / ought to ring her this morning. 7We must / mustn’t forget to take towels to the beach. 8 I think you should / shouldn’t ask your teacher for help with your homework.