Example sentences of "be [vb pp] up over a period " in BNC.

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1 In fact there was a , I think some of the recent erm concerns about schools have come from an image that 's been built up over a period of time that the schools spend very little time on the , on the three Rs for example .
2 Strong and sometimes quite intense relationships with individuals are built up over a period of even a few weeks .
3 Clearly memories are not formed instantaneously , as if by throwing a switch , but are built up over a period of hours after the event to be memorized has occurred ; during this build-up the form in which any memory is stored changes .
4 it is n't necessary , well it is the same as saying it is n't true , it is n't necessary er because this will be built up over a period and it will be for er the Government in all the normal ways in the public expenditure round to decide how much goes into the passenger franchises and through that therefore into the Briti the Rail Track investment .
5 Another proof is taken and so the print is built up over a period of time .
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