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

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1 I ca n't remember for certain but I think my wage was £2 per week .
2 Answering this kind of question will inevitably involve you in a certain amount of guesswork , because you ca n't know for certain what has been going on , but some assumptions are more likely than others .
3 In fact I ca n't say for certain that it ever arrived .
4 ‘ I ca n't say for certain .
5 However , at the beginning of the year we can not know for certain what the inflation rates will be ; we can only have expectations about what they will be .
6 While I can not say for certain that the aquarium located at the Oceanographic Institute , Monaco boasts this title , it does contain some stunning displays of tropical freshwater and marine fish and is well worth a visit .
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