Example sentences of "know [Wh det] it is for " in BNC.

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1 If one can notice the absence of something one must already know what it is for things to be absent .
2 It 's been very hard for years , and now , to be back here , you do n't know what it is for me .
3 If your experiment involves other people ( e.g. if you are comparing different readers ' responses ) , you need to consider ethical issues which arise , including ( a ) getting their permission to use the results ; ( b ) showing them the results and explaining them ; ( c ) not using their names when you report the experiment ( even if they have given permission for this , there is unlikely to be any point ) ; ( d ) the ethical problem that sometimes an experiment is best conducted if the test subjects do n't know what it is for ; that is , if there is a " secret agenda " .
4 He starts by remarking that scientists and ( at that time ; he was writing in the 1950s ) philosophers usually take science as the understanding of an independent reality , with the presumptions that they know what it is for something to be ‘ real ’ and for someone to ‘ understand ’ it .
5 It gives criticism , and critical theory , no way of knowing what it is for : no way , that is , — of arguing for one kind of production against another , or of valuing some forms over others .
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