Example sentences of "not know for sure " in BNC.
Next page| No | Sentence |
|---|---|
| 1 | The Trinidad crashed near Madrid , and to this day we still do not know for sure what happened . |
| 2 | 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 . |
| 3 | 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 . |
| 4 | 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 . |
| 5 | 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 . |
| 6 | 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 . |
| 7 | 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 . |
| 8 | Exactly how it happened we still do not known for sure but you can find examples of the kind of organisms it produced in almost any patch of fresh water . |
| 9 | Whether we get linguistic ability from our genes , or by imitating others or just from general intelligence is not known for sure . |