| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [adv] [verb] [adv] | 157 |
|
| 2 | [modal v] [not/n't] [adv] [verb] [Wh adv] | 80 |
|
| 3 | [vb mod] [not/n't] [adv] [verb] [Wh adv] | 80 |
|
| 4 | could [adv] [adv] [verb] [Wh adv] | 34 |
|
| 5 | could [not/n't] [adv] [verb] [Wh adv] | 31 |
|
