| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who could [not/n't] [verb] | 338 |
|
| 2 | who could [not/n't] [vb infin] | 336 |
|
| 3 | [pron] could [not/n't] keep | 110 |
|
| 4 | who [modal v] [not/n't] keep | 15 |
|
| 5 | who [vb mod] [not/n't] keep | 15 |
|
| 6 | who could [adv] keep | 8 |
|
| 7 | who could [not/n't] keep | 7 |
|
| 8 | who could [not/n't] keep | 7 |
|
