1 You mustnt/ dont have to touch the cakes, 2 You mustn't /don't have to buy any cheese. 3 We mustnt/don't have to forget his birthday 5 You mustn't /dont have to do the washing up 5 Choose the correct answer. because they're for this evening. Theres lots of it in the fridge 4 You mustnt/ don't have to use your 3G. There's wi-fi in the school I can do it this evening. 6 You mustn't/don't have to talk during the lessons. The teacher gets really angry if you do.