| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] could be [verb] | 1062 |
|
| 2 | [conj] could n't [verb] | 408 |
|
| 3 | could n't be [verb] | 377 |
|
| 4 | [conj] could n't be | 55 |
|
