| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not be | 25780 |
|
| 2 | [vb mod] not be | 25780 |
|
| 3 | could [adv] be | 7505 |
|
| 4 | could not be | 3440 |
|
| 5 | could [not/n't] be | 3440 |
|
| 6 | could not be | 2517 |
|
| 7 | could not [be] | 2517 |
|
