| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] [verb] for certain | 30 |
|
| 2 | [not/n't] [vb infin] [prep] certain | 29 |
|
| 3 | not [verb] [prep] certain | 28 |
|
| 4 | [not/n't] know [prep] certain | 20 |
|
| 5 | n't [verb] [prep] certain | 17 |
|
| 6 | [not/n't] know [prep] certain | 13 |
|
| 7 | [not/n't] [vb pp] [prep] certain | 10 |
|
| 8 | [not/n't] say [prep] certain | 8 |
|
| 9 | [not/n't] say [prep] certain | 8 |
|
| 10 | [not/n't] known [prep] certain | 7 |
|
| 11 | [not/n't] [verb] in certain | 7 |
|
| 12 | [not/n't] [to-vb] [prep] certain | 6 |
|
