must/have to：
① 表示必须、必要，在回答问句时，如果是否定的，必须用needn’t, don’t have to
eg. ---- Must I finish my homework before dinner?
---- Yes, you must.
---- No, you don’t have to / you needn’t.
② must是说话人的主观看法， 而have to则强调客观需要，have可根据时态人称的变化而变化
eg.That film is interesting,I really must go to watch.
You have to get to school before 8 am.
③ 表示推测、可能性（只用于肯定的陈述句）
eg.You must know that,you are a teacher.
dare/need:
① dare作情态动词用时, 常用于疑问句、否定句和条件从句中
eg.How dare you say that to me?
② need 作情态动词用时, 常用于疑问句、否定句
eg. Need I finish my homework before dinner?
③ dare和 need也可以做实义动词来用，独自充当谓语。
eg.The little girl dares to go to school by herself.
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