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问题: 英语

用现在完成时改写句子
He and his wife are having dinner now .
答案:
He and his wife have had dinner by present .
不知为什么?

解答:

完成时态的一个用法就是‘到现在为止刚刚结束的动作’。句子中有一个时间状语by present(截止到现在),由此可见,句子的意思是说‘到现在为止,他与妻子已经吃完饭’,表示一个刚刚完成结束的动作。