问题描述：
虚拟语气If I were U
都说If I都说If I were U 是对现在的假设,那么他可以表示对过去的假设吗?
例：
If I were U,I would have stopped that guy.
如果我是你（表示对过去某一时刻的假设）,我就会阻止他了.
都说If I都说If I were U 是对现在的假设,那么他可以表示对过去的假设吗?
例：
If I were U,I would have stopped that guy.
如果我是你（表示对过去某一时刻的假设）,我就会阻止他了.
问题解答：
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