dare和need作为情态动词（后接动词原形）的反意疑问句，疑问部分常用 need (dare ) +主语。
We need not do it again, need we ?
He dare not say so, dare you?
当dare, need 为实义动词（敢，需要）时，疑问部分用助动词do + 主语。
She doesn't dare to go home alone, does she?
must特殊些
当作"必须"时，用needn't提问
You must go now,needn't you?
当是mustn't(不允许，禁止)时，用must/may提问。
You mustn't smoke here,must/may you?
当must表推测，译为“一定，准是”时，要将句子改为i am sure that从句，反义疑问部分的动词形式根据be sure后的宾语从句的谓语动词形式决定。
例如，You must be hungry→i am sure that you are hungry,aren't you?
→原句变为You must be hungry,aren't you?
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