1 We mustn’t / don’t have to use our mobiles here. They are not allowed!


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 / oughtn’t pack many heavy things in your bag.​