| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] not [be] | 35053 |
|
| 2 | [modal v] not [be] | 35053 |
|
| 3 | could [adv] [be] | 7505 |
|
| 4 | could not [be] | 3440 |
|
