| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not [be] [vb pp] [verb] | 1377 |
|
| 2 | could [adv] [be] [vb pp] [verb] | 391 |
|
| 3 | could not [be] [verb] [verb] | 211 |
|
