| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] be [vb pp] | 2250 |
|
| 2 | [verb] [not/n't] be [vb pp] | 272 |
|
| 3 | [verb] could be [vb pp] | 180 |
|
| 4 | [verb] could [not/n't] be | 39 |
|
