You must eat and drink here.(否定句)

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You must eat and drink here.(否定句)

You must eat and drink here.(否定句)
You must eat and drink here.(否定句)

You must eat and drink here.(否定句)
You needn't eat and drink here.
ps:
must的否定形式有三种:
must做“应该”讲(表“义务性”),否定形式是mustn't,表示不应该.
must做“准是”讲(表“推断性”),否定形式是can not,表示不可能.
must做“必须”讲(表“必要性”),否定形式是need not,表示不必要.
请计较以下两个句子体会一下mustn't VS needn't:
You mustn't do that again next time.
下次你不可再做这种事了.
You needn't hand in your exercise-book tomorrow.
明天你不必交练习本.