Example sentences of "difficult to [be] certain " in BNC.
Next page| No | Sentence |
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| 1 | 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 . |
| 2 | 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 . |
| 3 | Many studies have been performed using in vitro tests and it is difficult to be certain of the relevance of these tests to platelet function in vivo . |
| 4 | Spokesman Andrew Davis said : ‘ We believe freak weather conditions may have caused an inversion , but it is difficult to be certain at this stage . |
| 5 | In the absence of a greater range of evidence it is difficult to be certain about how representative the Sutton Hoo mound 1 boat is of the range of ship types . |
| 6 | Now , they were combined and synthesized on aesthetic principles which apparently did not always depend on the content of the subject matter , although it is difficult to be certain in an area such as this . |
| 7 | On the other hand , it was sometimes difficult to be certain of this , for there were some lairds who took a very unfavourable view of such officers , and there was a danger that a politician who desired to win a friend might make a mortal enemy . |
| 8 | A variety of wording is used and it is difficult to be certain how such clauses will be interpreted ; but the change in judicial attitudes just noted would suggest that they will fare better than did the clause in Anisminic . |
| 9 | To be sure it is a little difficult to be certain how big " large " has to be before this behaviour sets in — indeed it was emphasised by Bohr and his friends that the line could be drawn at different places along the chain — but somewhere this classical behaviour had to set in to make measurement possible . |
| 10 | It was described in a Greek herbal written in the third century B.C. and is probably a native of the eastern Mediterranean area , though it is now so widespread it is difficult to be certain of its origin . |
| 11 | It is difficult to be certain of the impact of unemployment upon women . |
| 12 | Never use detergent for cleaning , as it is difficult to be certain when all traces have been removed . |
| 13 | It is difficult to be certain from the passage whether Hezarfen believes there to have been official muftiliks at all in the fifteenth century , but he is clear on the point that the arrangements for whether formal or informal , were similar in the three cities . |
| 14 | Because of interactions between activators and quenchers , and between intrinsic and extrinsic luminescence centres , it is often difficult to be certain of the cause of luminescence in a given mineral . |
| 15 | 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 . |