补充,口语很少用must,must是很强烈的意思.have to比较客观,语气也比较软,就算是要说我必须怎么怎么样的时候,大多数情况都用 I have to...
再有,have to 的否定就是 don't have to 或者 doesn't have to.
比如：I have to go to school.
I don't have to go to school.
没有haven't to的用法.
have to和must有什么区别?have to的否定形式是什么?
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