否定句：You don't need to /needn't have breakfast in the morning.你可以不在早上吃早饭
如果是mustn't的话，表示禁止的意思，“禁止你早上吃早饭”，应该是错的。
这里想要区分don't need和needn't的话，
don't need 中need是实义动词，needn't中它是情态动词
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第1个回答 2022-07-10
您好，You must have breakfast in the morning. 的否定形式，需要看语义，这里的 must have 应该以为（一定要），所以否定可以考虑：
1）You needn't have breakfast in the morning.（needn't 译为【不需要】）
2）You shouldn't have breakfast in the morning.（shouldn't 译为【不应该】）
3）You mustn't have breakfast in the morning.（mustn't 译为【禁止】，通常当 must 作为（需不需要时）mustn't 不作 must 的否定形式，因为 mustn't 是禁止某人做某事】
第2个回答 2022-07-10
You must not have breakfast in the morning.
注：must not可以写为mustn't(缩写)
第3个回答 2022-07-10
You must haven't breakfast in the morning.
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