| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [verb] | 32838 |
|
| 2 | could n't [verb] | 12359 |
|
| 3 | n't [adv] [verb] | 12294 |
|
| 4 | could n't [adv] | 1014 |
|
