| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could n't [verb] | 9355 |
|
| 2 | they [modal v] n't [verb] | 3240 |
|
| 3 | they could [adv] [verb] | 1886 |
|
| 4 | they could [not/n't] [verb] | 1283 |
|
| 5 | they could not [verb] | 1281 |
|
