A: It's twenty past eight now. He didn't make it.
B: (trying to be optimistic) We don't know (that).
A: He didn't make it, OK? He would have called us by now if he had.
Would you include 'that' here? (B's saying that they can't be sure that he didn't make it)
anonymous Would you include 'that' here? " A bare "We don't know" is possible, but it sounds incomplete.
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anonymousWould you include 'that' here?
I think you almost have to add "that" or something more, for instance "We don't know he didn't." A bare "We don't know" is possible, but it sounds incomplete.