have to 分类:情态动词 定义 必须、不得不,强调客观上的必要性。 用法 表示客观上的必须 有人称、时态和数的变化 否定形式表示’不必’ 例句 I have to go now. (客观需要) She has to work on Sundays. You don’t have to come if you don’t want to. (不必) 相关术语 must had to need to 情态动词