| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] have [verb] a | 82 |
|
| 2 | could [not/n't] [verb] for a | 24 |
|
| 3 | could [not/n't] have [verb] for | 24 |
|
| 4 | [not/n't] have [verb] for a | 19 |
|
| 5 | could have [verb] for a | 8 |
|
