| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] n't [verb] [adv] [pron] | 787 |
|
| 2 | could [adv] [verb] [adv] [pron] | 437 |
|
| 3 | could [not/n't] [verb] [adv] [pron] | 353 |
|
| 4 | could not [verb] [adv] [pron] | 352 |
|
