| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [not/n't] [vb infin] | 100840 |
|
| 2 | [modal v] [not/n't] [vb infin] | 100840 |
|
| 3 | could [adv] [vb infin] | 32770 |
|
| 4 | could [not/n't] [verb] | 21358 |
|
| 5 | could [not/n't] [vb infin] | 21338 |
|
