Example sentences of "they must have been [v-ing] [prep] " in BNC.

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1 They must have been watching from a hill-top as I rode towards them because suddenly I was surrounded by a company of about 40 soldiers , all aged between 17 and 18 years .
2 Master Thomas said they must have been looking for people , not things , and thought you should be warned , so … ’
3 They must have been singing for , though Sharpe could hear nothing , he could see their mouths opening and closing in unison .
4 They must have been riding for a long time , but there was no sign of a large town , only a solitary light shining ahead .
5 They must have been moving alongside us in cover , taking our measure , and they had two archers ahead , one either side the track .
6 They must have been waiting in a car , as neither wore an overcoat and both were suddenly there smack in front of me , blocking the pavement , tantalizingly close to home .
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