Example sentences of "must [verb] be [v-ing] [det] " in BNC.

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1 It must have been discouraging that Adieu was not thought worthy to be given at Sadler 's Wells , and that the more handsome setting which Stevenson had designed for it was not used at that time .
2 So she must have been wearing some funny shoes to get corns on
3 Let's hope he or she cares about you enough to say , ‘ You know you should have called me earlier-you must have been holding this in for days ! ’
4 She must have been straining all day .
5 He must have been causing some problems .
6 The suddenness of the increased use of artillery in the third quarter of the fourteenth century is evidenced by the fact that when Gaston Fébus , vicomte of Béarn in the Pyrenees , had a network of fortifications constructed between 1365 and 1380 ( a period during which many castles were built in France ) he must have been building some of the last fortifications to take no account of artillery , which was very soon to compel important developments in the art of defence .
7 Agnes said the words to herself , her mind telling her that this was the end of June and her sister must have been carrying this dreadful secret since … when ?
8 Alex 's strange position in the production must have been making all of the usual understudy agonies even worse .
9 What intrigues me is that Mailer has spent years on it , has published almost 1,200 pages , is at work on part two and must have been doing all this while the Reagan/Bush/Casey/North epoch went rolling past a society and a mass media obsessed with Nancy 's wardrobe and the cultivation of the perfect junk-bond .
10 Well he must have been doing that with the saucepan , he 's pulled all the carpet up .
11 Kammerer must have been imposing such intense selection on such a large sample of eggs that he was able to filter out the odd egg that carried the remnant complex of genes still present in the species ' gene pool at very low frequencies .
12 I must have been arranging those flowers , and setting the lighted candles round them , at the very moment my father was dying .
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