Example sentences of "have know for [noun] that " in BNC.

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1 I 've known for years that I 'm as good a guest at a dinner party as I am a lousy host .
2 I 've known for months that … that what I feel for you is special , very special .
3 On the other hand , he said ID cards were ridiculous and confirmed what fans had known for years that they were ill- treated by uncaring clubs who were allowing grounds to fall into disrepair .
4 Veterinarians , horticulturists and environmental scientists have known for years that fluoride at very low concentrations can damage vegetation , aquatic life and livestock ; chemists have learnt to expect the unexpected from this unpredictable element ; and biochemists , physiologists and toxicologists all know that fluoride is a potent poison of enzymes .
5 We have known for years that there are many wrecks which could be of historical value , telling us about the way in which vessels were constructed and , from their contents , about how ordinary people lived in times past .
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