| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] n't be | 9273 |
|
| 2 | [modal v] n't be | 9273 |
|
| 3 | could [adv] be | 7505 |
|
| 4 | could [not/n't] be | 3440 |
|
| 5 | could not be | 3440 |
|
| 6 | could n't [be] | 923 |
|
| 7 | could n't be | 923 |
|
