3 Read and circle. 2 You ought not to / don't have to wear sunglasses on a sunny day, but it's a good idea. 1 You have to /mustn't cross the road without looking first. 3 You must/don't have to bring your own towel. Towels aren't available at the swimming pool. 4 You must/should do your homework in the afternoon after school, but you can also do it later. 5 You ought to /shouldn't eat so many sweets. They're bad for you. 6 You shouldn't/ought to switch off lights when you leave a room. It saves energy. 7 Students at my school have to / mustn't wear a school uniform.​

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