为什么不能用can't
without gravity,we couldn't walk on the ground as freely as we do now
变为without gravity,we can't walk on the ground as freely as we do now
人气：337 ℃ 时间：2020-02-04 00:04:59
解答
这个就是虚拟语气.
没有重力,我们就不可能象我们现在那样在地上走.
其实,重力是存在的.所以,用过去式表示虚拟的.
又如：
If I were you,I would leave.
如果我是你,我就走.
（我不可能是你的：虚拟的）
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