Example sentences of "[subord] they have [be] [v-ing] for " in BNC.

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1 By searching for flashes repeating at exactly the same rate as the radio pulses , they were able to investigate much fainter pulsations than if they had been looking for pulses occurring at an unknown rate .
2 She did n't know if they had been driving for minutes or days .
3 if they have been sniffing for so e time , arrange a health check
4 When we have breakfast , on the 8th floor , we can look down on the river , and watch all the river traffic , including large passenger vessels , big merchant ships belching smoke , strings of wooden barges , and big and small old-fashioned junks , which look as if they have been sailing for a 100 years at least .
5 He really did n't think the Revolution was anything more than a few peasants kicking up a fuss , like they had been doing for hundreds of years .
6 The fog lifted and the house became filled with a babble of excitable people , few of whom spoke English and who all arrived at once because they 'd been waiting for a clear passage .
7 Selfing populations of plants could be valuable material , although the retention of unused yet presumably expensive floral features in some populations raised doubts as to whether they have been selfing for long enough to reach evolutionary equilibrium .
8 ‘ I do n't know what he meant , ’ Allen said after they had been walking for some time on the soft turf at the verge of the track .
9 Or so he seemed to Sairellen Thackray who preferred her leaders to have the mature dignity of a Richard Oastler , whom she had followed on foot those ninety miles to York and back when they had been campaigning for the ten hour working day .
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