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 must boil the water first.的否定句
We must boil the water first.的否定句

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