It maybe that some have them already, but we cannot be sure.
也许有些人已经拿到了，但我们不能肯定。
It may be that some have them already, but we cannot be sure.
也许有些人已经拿到了，但我们不能确定。
We cannot be sure whether our dreams will come true.
我们不能确定我们的梦想是否将成真。
That is scary, and we cannot be sure about changes in the future.
这是可怕的，因为我们无法确定未来会发生什么变化。
Granting that he did say so, we cannot be sure what he really meant.
假定他那样说了，那也不一定是他的本意。
Granting that he did say so, we cannot be sure what he really meant.
假定他那样说了，那也不一定是他的本意。
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