Example sentences of "is [that] [pron] [verb] not know " in BNC.

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1 The short answer to this question is that we do not know how homoeopathic remedies work any more than we know how the majority of orthodox pharmaceuticals work .
2 By emphasising the ‘ primacy of action ’ what these theologians are really saying is that we do not know — indeed we can not obtain knowledge except through praxis .
3 The reason that we can not calculate the necessary correction is that we do not know which way the photon went when it bounced into the microscope .
4 The difficulty with these two studies , unfortunately , is that we do not know how many patients ended up with a definite myocardial infarction ; an initial electrocardiogram only was used .
5 The truth of the matter is that we do not know how — in any meaningful , scientific , experimentally demonstrable sense — advertising works .
6 Part of the problem with encouraging girls to take ‘ useful ’ subjects is that we do not know whether it makes any difference to the kinds of jobs they eventually do ; and whether , indeed , these jobs would still be highly rated if women did them .
7 They 're unique and what makes them unique is that they do not know it . ’
8 My one advantage is that they do not know the layout of the flat .
9 But as the London Food Commission points out : ‘ The problem for consumers at the moment is that they do not know which are the PVC clingfilms .
10 But if one is dealing with anything other than empirical knowledge of this kind — if , in short , one does not personally know in the sense just explained — the only honest thing one can say is that one does not know .
11 The explanation is that you lack control or feel at the end of the stick , and the reason is that you do not know where the end is .
12 the reason the world does n't know us is that it did not know him .
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