| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] have [noun] | 37 |
|
| 2 | [not/n't] have have [noun] | 37 |
|
| 3 | could [not/n't] have have | 36 |
|
| 4 | could have have [noun] | 18 |
|
