| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could n't have [vb pp] | 469 |
|
| 2 | could n't have [verb] | 469 |
|
| 3 | [modal v] n't have said | 111 |
|
| 4 | could [adv] have said | 48 |
|
| 5 | could [not/n't] have said | 41 |
|
| 6 | could not have said | 41 |
|
| 7 | could n't have say | 20 |
|
| 8 | could n't [verb] said | 20 |
|
