Example sentences of "ca not [adv] have [be] " in BNC.

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1 ‘ It ca n't just have been a whim . ’
2 When you ca n't ever have been guilty of it . ’
3 ‘ But Mr Aldrich ca n't possibly have been our guilty party either , can he ?
4 He ca n't only have been Donald the Great Doctor .
5 ‘ She ca n't really have been a witch .
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