| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [not/n't] be | 35057 |
|
| 2 | could [adv] be | 7500 |
|
| 3 | could [not/n't] be | 3440 |
|
| 4 | could [not/n't] [be] | 3440 |
|
| 5 | could [not/n't] [be] | 3437 |
|
