We use the futureperfecttense to talk about an action that will be completed at a given time in the future.
我们用将来完成时态来形容一个在未来特定的一个时间已经完成的动作。
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There are three kinds of shapes of the tenses in the Utopia Novels of the later Qing Dynasty: the future past tense, the futureperfecttense and the future continuous tense.