| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [verb] | 21358 |
|
| 2 | [not/n't] be [verb] | 18152 |
|
| 3 | could be [verb] | 15987 |
|
| 4 | could [not/n't] be | 3437 |
|
