Using have to to express necessity and obligation in future and past tenses

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Using HAVE TO to express necessity and obligation in future and past tenses

在将来或者过去表达责任、义务和必须,我们不使用mustneed。它们被have to给代替:
We must (need to) buy another ticket我们必须买另外一张票。
We had to buy another ticket yesterday我们昨天应该买另外一张票的。
We'll have to buy another ticket later我们等会儿应该买另外一张票。

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