| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [not/n't] [vb infin] for certain | 11 |
|
| 2 | [modal v] [not/n't] say for certain | 8 |
|
| 3 | [modal v] n't [vb infin] for certain | 7 |
|
| 4 | can [not/n't] [vb infin] for certain | 6 |
|
| 5 | could [not/n't] [vb infin] for certain | 5 |
|
| 6 | could [not/n't] [vb infin] for certain | 5 |
|
