| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not say [prep] certain | 8 |
|
| 2 | [vb mod] not say [prep] certain | 8 |
|
| 3 | could not say [prep] certain | 5 |
|
| 4 | could not say [prep] certain | 5 |
|
