| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [be] [verb] | 2288 |
|
| 2 | could [not/n't] [adv] [verb] | 1461 |
|
| 3 | [not/n't] [be] [adv] [verb] | 904 |
|
| 4 | could [be] [adv] [verb] | 642 |
|
| 5 | could [not/n't] [be] [adv] | 355 |
|
