| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | n't [vb infin] [prep] certain | 17 |
|
| 2 | n't [verb] for certain | 15 |
|
| 3 | n't know [prep] certain | 8 |
|
| 4 | n't know [prep] certain | 8 |
|
| 5 | n't say [prep] certain | 5 |
|
| 6 | n't say [prep] certain | 5 |
|
