TAG：had to

1 Had to表示"不得不，必须"，用于表达强制、义务或压力。 2 这种用法通常与情态动词“should”或“ought to”替换，并加上动词不定式，以避免过度使用had to。 3 比如，我们可以说“I had to study for the exam”，或者用“should have”替换为“I should have studied for the exam”，以减少had to的使用。 had to 表示“不得不做某事”，是have to的过去式...

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had been done是过去完成时的被动语态 和had to be done是情态动词have to的被动语态。 例如，到上个月底，高中英语课本内容全部被上完了。 For example, by the end of last month, all the contents of the high school English textbooks had been finished. 这些垃圾昨天就不得不处理了。 The rubbish had to be disposed of...

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"have to"、 "has to"和"had to"的区别在于不同的时态和主语。 "Have to"是一般现在时，用于表达现在的必要性和义务，例如："I have to finish my homework." "Has to"是一般现在时，主语是第三人称单数，例如："She has to go to school today." "Had to"是过去完成时...

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