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有关beback为什么有人说youarebackby9o'clock.这个句子不正确?若正确,还有youaretobebackby9o'clock怎么翻译?

题目详情
有关be back
为什么有人说you are back by 9 o'clock.这个句子不正确?若正确,
还有you are to be back by 9 o'clock怎么翻译?
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答案和解析
you are back by 9 o'clock.现在时态,意思不对.因为你面对对方说话时,你不能说:(现在)你得九点前回来.
而You are to be back by 9 o'clock.是将来时,意思就是“你得在九点前(将)回来.
所以,第二句正确.