Example sentences of "they [modal v] have been [prep] [det] " in BNC.

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1 They must have been at that game for ages — and no anaesthetics , either .
2 The Ministry did tell us not to waste effort growing flowers , but somehow one always felt they were not quite as right as they might have been on that one .
3 They might have been like this for three centuries , and could be for three centuries more .
4 They were n't twins , but they could have been in some respects , she realised .
5 In fact they are no more adequate for primitive societies than they would have been for any others .
6 And they would have been at that muckle supper .
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