Example sentences of "could [not/n't] [verb] for certain " in BNC.

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1 ‘ Whilst it was the physician 's opinion that she had not had carnal relations for some two years , he could not say for certain .
2 Mrs Ayers , who is still recovering from the shock , said at the moment she could not say for certain anything had been taken .
3 Until now she had n't taken much notice of him , so she could n't say for certain whether he was handsome or not .
4 Something in the atmosphere of the room seemed to have changed in the course of the last few moments , and Liston could n't say for certain what it was .
5 I could n't say for certain what our smallest listed building is , but I suspect that some old wall-mounted pillar boxes will be strong candidates !
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