| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [verb] [adv] | 922 |
|
| 2 | [not/n't] [verb] [adv] [subord] | 917 |
|
| 3 | could [not/n't] [verb] [subord] | 298 |
|
| 4 | could [verb] [adv] [subord] | 168 |
|
