| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [not/n't] be [vb pp] | 15687 |
|
| 2 | could [adv] be [vb pp] | 4744 |
|
| 3 | could [not/n't] be [verb] | 2289 |
|
| 4 | could [not/n't] [be] [vb pp] | 2251 |
|
