| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] could [not/n't] [vb infin] | 961 |
|
| 2 | could [not/n't] [vb infin] what | 352 |
|
| 3 | [adv] [not/n't] [vb infin] what | 16 |
|
