| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] not [vb infin] [verb] [conj] | 617 |
|
| 2 | [modal v] not [vb infin] [verb] [conj] | 617 |
|
| 3 | could [adv] [vb infin] [verb] [conj] | 235 |
|
| 4 | could not [verb] [verb] [conj] | 164 |
|
| 5 | could not [vb infin] [verb] [conj] | 163 |
|
