Example sentences of "do [adv] know for " in BNC.

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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 The Trinidad crashed near Madrid , and to this day we still do not know for sure what happened .
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 How long it took the different ancestors of these very different animals to evolve such tongues we do not know for there is no fossil evidence of any antiquity to tell us , but it must have been several million years .
6 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 .
7 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 .
8 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 .
9 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 .
10 Do n't know for sure yet , but there wo n't be any European corporate jobs left after we centralise everything in Detroit .
11 [ In talking about continued home care ] I can stand the strain at the moment , but I do n't know for how long I can go on .
12 I do n't know for sure that Ernest is going to emigrate . ’
13 ‘ I do n't know for sure .
14 ‘ I do n't know for sure , girlie , but we 'll sort it all out in the end , just see if we do n't .
15 WHETHER HEROIN is at the root of this unreliability I do n't know for sure , nor am I about to proscribe the freedom — or is that stupidity — of anyone to take whatever substance they choose to take , be it alcohol , tobacco , heroin or carpet cleaner .
16 We do n't know for sure .
17 We do n't know for certain but it was probably to be given to you on your arrival . ’
18 Already the ‘ What I want for Christmas ’ letters are pouring into Mr Brooke , although the goodies ( we do n't know for certain what they will amount to — that would spoil the surprise — but if we are lucky they may amount to £36 million per sector ) will not be dispensed for two years at least .
19 Yes , probably , but I do n't know for sure .
20 Is that the general , I mean I do n't know for all you car drivers have any thing to say about public transport , maybe you do n't know any more but those of you who use it , I mean is hopeless the general view ? , yes
21 ‘ I do n't know for sure where she goes , ’ he admitted to Wayne .
22 ‘ You do n't know for sure that this is why the agency was raided .
23 ‘ We do n't know for sure that it 'll strike , ’ said Duvall .
24 ‘ Of course I do n't know for sure .
25 It seems likely she did , but we do n't know for sure .
26 ‘ Listen , Rod , we do n't know for sure .
27 But I do n't know for sure . ’
28 What Ah do n't know for certain is what happened immediately before that .
29 ‘ I should n't think so for one minute but I do n't know for certain . ’
30 If you do n't know for sure which type of drive you have check the ribbon cable running into it .
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