| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have have a | 16 |
|
| 2 | could [adv] have had a | 16 |
|
| 3 | could [not/n't] have have a | 11 |
|
| 4 | could not have have a | 11 |
|
| 5 | could n't have have a | 6 |
|
| 6 | could [adv] have have a | 5 |
|
| 7 | could not have have a | 5 |
|
