Example sentences of "not know for [adj] " in BNC.
Next page| No | Sentence |
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| 1 | I do not know for certain why I went up there to watch them doing it . |
| 2 | And though we do not know for certain , it does seem doubtful that the only sins against EPA science are those that have been revealed . |
| 3 | We do not know for certain what the total membership of any such set is , how many items belong to it , or the extent to which speakers vary in assigning items to the set . |
| 4 | However , at the beginning of the year we can not know for certain what the inflation rates will be ; we can only have expectations about what they will be . |
| 5 | A senior officer said : ‘ We have not exhausted all our enquiries yet and we do not know for certain if those ransom calls were the work of cranks . |
| 6 | The Trinidad crashed near Madrid , and to this day we still do not know for sure what happened . |
| 7 | Camilla 's sister , Annabelle Elliott , admitted that she does not know for sure whether there is any truth in rumours of a relationship with Prince Charles . |
| 8 | She thought that her father probably now earned more than £100,000 a year , but she did not know for sure because it was nine years since she had last visited him , four years since she had last received a Christmas card from him . |
| 9 | But even if we discover that vineyards vanished from south east England at a time when the climate was getting colder , we still do not know for sure why they disappeared . |
| 10 | Then , when price is low firms do not know for sure whether it was because someone cheated ( produced a larger than agreed output ) , or because demand was low . |
| 11 | What the precise purpose was of installing complex electronics in an old sailing vessel he did not know for sure , and Iain did not press him . |
| 12 | Ages recorded on death certificates ( and to a lesser extent on marriage certificates ) were not always accurate because the informant did not know for sure . |