Example sentences of "[Wh adv] [det] [modal v] have been [verb] " in BNC.

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1 It was far from clear to the pope how this could have been transmitted to the whole human race unless there had been an historical Adam and Eve , that is , a single set of parents .
2 It is difficult to see how this could have been avoided .
3 Such attitudes to both the giving and receiving of aid ( and they are so common ) spell the same dismal answer — an opportunity missed , for how much could have been achieved by a well-funded national commission .
4 The failure of the continuation school movement shows that the class position of the prospective pupils , rather than any age relationship , determined that the significance of their labour power was more important than their further education , however that may have been defined .
5 Layers of organic muds of swamp origin will be interspersed with wedge-shaped horizons of marine sediments thinning landwards and representing marine advance , however this may have been caused , levees of coarser sediment will follow the courses of former distributaries , while fanshaped spreads of such material will mark the sites of levee breaches .
6 Why this should have been thought evidence of scurrility was known only to Joyce ‘ s peculiar logic .
7 Continuing our top-down approach to discourse , it is logical that having identified the sender and receiver , the discourse type and the parts within it , we should turn our attention to organization within parts of the discourse — however these may have been identified and defined .
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