We must boil the water first.的否定句

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We must boil the water first.的否定句

We needn't boil the water first.(我们不必先烧水)
楼上的用了mustn't 单单就语法是对的.但意思有点问题,意思是:我们绝不能先烧水.一般不会这么说的

We needn't boil the water first.

We mustn't boil the water first.

We mustn't boil the water first. must这里表示不必 在must表推测时且为否定句再用can来替换 没有用need来替换的