Example sentences of "must [vb infin] [be] very considerable " in BNC.

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1 The prestige of Oswiu 's family , or else its capacity for intimidation , must have been very considerable for Aldfrith to return and rule in what seems to have been domestic peace .
2 Its influence must have been very considerable for the boy to have been so successfully supported for the kingship against an adult rival .
3 It might appear that Mynne and his family had been ruined by a combination of the forest laws , the drive against exacted fees , and finally by backing the losing side in the civil war : yet their liquid assets must have been very considerable .
4 This movement was transmitted to cranks on the rear wheel by connecting rods ; the machine weighed almost exactly half a hundredweight and the physical effort required to ride it must have been very considerable .
5 At all events the rent from them must have been very considerable .
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