Example sentences of "have demonstrated [conj] it [is] " in BNC.
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| 1 | Eleven years of trapping has demonstrated that it is inadvisable to generalise from two or three years ' experience . |
| 2 | The audit regime has teeth and , through refusing to register some firms and imposing conditions on others , the Institute has demonstrated that it is not afraid to bite . |
| 3 | By recording body temperatures throughout the day of groups of well-adjusted shiftworkers , intolerant shiftworkers , and day-workers who had given up shiftwork because they could not tolerate it , Reinberg has demonstrated that it is indeed the best-adjusted group whose circadian rhythm was most immutable . |
| 4 | The Bolivian tin miners and the Chilean unions have demonstrated that it is possible for the labour movement to develop a revolutionary role in Latin America . |
| 5 | Capillaries also generate prostacyclin ( Goehlert et al , 1981 ) and studies with cultured cells have demonstrated that it is endothelial cells which are the main source ( Weksler et al , 1977 ) . |
| 6 | They have demonstrated that it is possible to construct systems of clinical budgeting in acute hospitals . |
| 7 | Such heroic experiments therefore show a diminishing return in giving insight into the effects of loss of sleep , although they have demonstrated that it is an intensely stressful experience , taxing the psychological resources of individuals to their utmost . |
| 8 | But community services for mentally handicapped people have demonstrated that it is possible to provide for quite severely disturbed , multiply-handicapped people in specially adapted ordinary flats and houses , as long as there are sufficient well-trained staff to provide good-quality care round the clock , and provided the staff themselves are well supported by senior professionals with the right experience . |