| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could n't [verb] [pron] | 3812 |
|
| 2 | [vb mod] n't know [pron] | 203 |
|
| 3 | [modal v] n't know [pron] | 203 |
|
| 4 | could [adv] know [pron] | 20 |
|
| 5 | could not know [pron] | 16 |
|
| 6 | could [not/n't] know [pron] | 16 |
|
| 7 | could n't know [pron] | 9 |
|
