Example sentences of "difficult [prep] [be] sure [prep] " in BNC.
Next page| No | Sentence |
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| 1 | The Roman emperors of the later third century AD made very similar coins at a number of mints , and it is difficult to be sure about their correct attribution . |
| 2 | Go much below that and the monitoring problems are vastly complicated by natural upsets , like earthquakes and even man-made chemical explosions ( which would also make a comprehensive test ban pretty difficult to be sure of ) . |
| 3 | It is difficult to identify this character in unsectioned skulls , but it is likely that some degree of airorhynchy is primitive for hominoids , greatly exaggerated in the pongine lineage and modified towards klinorhynchy in hominines , but as my observations lead me to believe that the bonobo is airorhynchous to some degree , it is difficult to be sure of the ancestral hominine character state . |
| 4 | It spans a period of over 600 years , i.e. from about 1900 BC to about 1250 BC , though it is notoriously difficult to be sure of dates at this early stage of Israel 's history . |
| 5 | It can be very difficult to be sure of why a hoard of objects was buried in the ground . |
| 6 | In the circumstances , it is therefore often difficult to be sure of the first arrival . |
| 7 | First of all , I think that it it 's difficult to be sure of this because of the way in which the County Council prepared their the evidence on which I relayed relied and like Mr I did n't come here prepared to talks in detail about the inner northern . |