Example sentences of "and it has prove [adj] " in BNC.
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| 1 | With a few exceptions , insectivores are much less commonly represented in pellet assemblages , and lagomorphs even less so , and it has proved impossible to obtain large enough samples of these species to provide numerical data . |
| 2 | He had normal hearing all his life and it has proved impossible to discover what aroused his interest in deafness . |
| 3 | In other experiments , Papi has shown that pigeons do not home accurately if their nostrils are blocked , or if their olfactory nerve is cut , or if they are experimentally distracted by a strong smell ; but other experimenters have failed to repeat these results and it has proved impossible to train pigeons to make the relevant olfactory distinctions ( which is a standard , and powerful , method of testing for sensory abilities — p. 43 . |
| 4 | Robert 's parents , Garry and Thelma , both 26 , paid for the second operation which was carried out in November 1991 and it has proved successful . |
| 5 | Control of money supply ( M3 ) has been erratic , and it has proved difficult to establish a relationship between the changes in M3 and the fall in inflation . |
| 6 | It has retained the strong legs and good feet of a draught animal , so that it can travel long distances over rough terrain on the range , and it has proved able to withstand the stress of drought better than other Bos taurus breeds . |