| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [verb] | 21358 |
|
| 2 | [not/n't] [verb] for | 4412 |
|
| 3 | could [verb] for | 800 |
|
| 4 | could [not/n't] for | 23 |
|
