Example sentences of "[noun] [pers pn] [verb] [adv] know for " in BNC.

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1 ‘ Of course I do n't know for sure .
2 What the precise purpose was of installing complex electronics in an old sailing vessel he did not know for sure , and Iain did not press him .
3 WHETHER HEROIN is at the root of this unreliability I do n't know for sure , nor am I about to proscribe the freedom — or is that stupidity — of anyone to take whatever substance they choose to take , be it alcohol , tobacco , heroin or carpet cleaner .
4 She had always been the sensible , down-to-earth twin , yet here she was , going away with a man she had only known for two days .
5 ‘ But I do n't think people in business are that open to contacting a firm they do n't know for a health check . ’
6 How long it took the different ancestors of these very different animals to evolve such tongues we do not know for there is no fossil evidence of any antiquity to tell us , but it must have been several million years .
7 Rhoda he had also known for some time .
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