Example sentences of "[vb infin] [prep] period " in BNC.

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1 So while the male bi-coloured damselfish attracts his mates by chirping — the sound increasing to a crescendo if a female happens to pass by — there is a species of minnow which purrs , the cod grunts and the love song of the male haddock resembles the sound of a motorbike , a quite unmelodious call which it can sustain for periods of up to twenty minutes .
2 The ideal end state is reached when the student can accurately assess her own performance , but this will only occur after periods of meeting externally set requirements .
3 As photographers know , a great deal can happen in periods of time as long as a hundredth of a second .
4 There are scenes on pottery which may relate to periods of licence and mockery .
5 For long periods there were Homes in the East March , the Kerrs of either Ferniehirst or Cessford ( related but mutually hostile ) in the Middle March , and the Maxwells in the West , save for periods when their feuding rivals the Johnstones took possession .
6 Consumption will rise in period t+4 : But investment will start to fall because , according to the accelerator , the level of investment depends on the change in income ( which has now begun to decrease ) : So , after rising from periods t to t + 3 , income has now stayed the same from period t + 3 to t + 4 .
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