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off. Must they leave? Yes, they must./No, they needn’t. 102 A We often use signs as well as words to tell people what to do or what not to do. Work in pairs to explain these signs. S1 says the sentences to S2. S2 gives the letters of the signs. 103 104 1 You must turn left. 2 You must be careful. 3 You must not smoke. 4 You must pay ten yuan. 5 You must not cycle. 6 You must not turn right. 7 You must not make a noise. 8 You must not enter. h e d g a c b f 105 B Mimi works for a newspaper. She answers letters from readers with problems. Read these two letters and answer them using must or must not and words in the box. make friends with more people eat so many sweets do more exercise spend so much stay up so late eat so much work harder eat more 106 Dear Hopeful You _____________________________________________________ _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Mimi must not eat so much. If you do not want to feel tired, you must not stay up