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must和need。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。
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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