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问题: By the end of next week he will be back。

By the end of next week he will be back。
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解答:

By the end of next week he will have been back home.

By短语表示过去时间是,最常见的情况与过去完成时连用。

By短语表示将来时间是,最常见的情况与将来完成时连用。