| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] not [verb] [verb] | 11311 |
|
| 2 | [modal v] not [verb] [verb] | 11311 |
|
| 3 | could [adv] [verb] [verb] | 3862 |
|
| 4 | could not [verb] [verb] | 2606 |
|
