Example sentences of "[verb] up over a period [prep] " in BNC.

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1 Er and it 's a force commitment it is n't I mean short of saving up over a period of years which we are not allowed to do
2 Another proof is taken and so the print is built up over a period of time .
3 Strong and sometimes quite intense relationships with individuals are built up over a period of even a few weeks .
4 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 .
5 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 .
6 All the small modifications should add up over a period of time to make major achievements .
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