| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] have had [art] | 16 |
|
| 2 | could [not/n't] have have [art] | 16 |
|
| 3 | could [not/n't] have have a | 11 |
|
| 4 | could n't have have [art] | 8 |
|
| 5 | could not have have [art] | 8 |
|
