| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [not/n't] [vb infin] | 14304 |
|
| 2 | who [modal v] [not/n't] [vb infin] | 1231 |
|
| 3 | who could [adv] [vb infin] | 489 |
|
| 4 | who could [not/n't] [verb] | 338 |
|
