Example sentences of "but it [vb mod] [verb] [be] [det] " in BNC.

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1 How long it took the different ancestors of these very different animals to evolve such tongues we do not know for there is no fossil evidence of any antiquity to tell us , but it must have been several million years .
2 It so happened that it fell to the lot of Geoffrey Holton and Chris Protheroe to do the donkey work in the Lusaka accident , but it could have been any of the twenty or so investigators in AIB .
3 but it could have been any hour of the day
4 He was describing Denis Law but it could have been this era .
5 I thought it was in support of the IRA but it could have been some other organization , such as the Women 's Liberation people .
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