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see a doctor at once when we have the flu ? 肯定回答: Yes, we must. 否定回答: No, we needn’t. / No, we don’t have to. 注:此處不能用 mustn’t (禁止;不準(zhǔn) )回答 Eg: Must I finish my homework now ? No, you needn’t. / No, you don’t have to. Make similar conversations after the example. Example: A: Must we do exercise to prevent the flu? B: Yes, we must. A: Must we take some medicine to prevent the flu? B: No, we don’t have to. / No, we needn’t. 2. A. Listen to the passage and circle the symptoms that you hear. fever cough headache backache toothache stomachache sore throat sore eyes B. Listen again and check the advice you hear. Should drink lots of boiled water t