| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [verb] [pers pn] | 3156 |
|
| 2 | [not/n't] [verb] [Wh adv] [pers pn] | 2829 |
|
| 3 | could [not/n't] [verb] [Wh adv] | 448 |
|
| 4 | could [verb] [Wh adv] [pers pn] | 93 |
|
