Example sentences of "[adj] to be certain [conj] " in BNC.
Next page| No | Sentence |
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| 1 | It is impossible to be certain that the child is making explicit his indecision about which square is being targeted ( though the eye movement record suggested that this was the case ) . |
| 2 | In the absence of an obvious bleeding point , it is impossible to be certain that bleeding originates from the angiodysplasia until the rest of the gastrointestinal tract has been examined . |
| 3 | The identification of fire arms is not difficult in crash wreckage but it is less easy to be certain that an explosion on board an aircraft in flight resulted from a bomb or perhaps a disintegrating turbine disc or an explosive decompression of the cabin . |
| 4 | It was hard to be certain but she was pretty sure he had n't , and she imagined she must have assumed he was on duty at the hospital . |
| 5 | First , such a change does not take place overnight among all artists ; and secondly it is very hard to be certain that a given statue from the Acropolis was actually set up before the invasion . |
| 6 | Even if scientists could demonstrate such a correlation , it would still be difficult to be certain whether the effect were the result of social or genetic transmission . |
| 7 | In assessing the effect of an anti-pain therapy , it is obviously important but difficult to be certain that the treatment has not simply prevented the animal from displaying the sign . |
| 8 | From the demonstration alone , it is difficult to be certain that the motion is chaotic , in the specific sense that the word is now used , and not just very complicated . |
| 9 | Never use detergent for cleaning , as it is difficult to be certain when all traces have been removed . |