| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] have have [noun sg] | 5 |
|
| 2 | could [not/n't] have have [noun] | 5 |
|
| 3 | could [not/n't] have had [noun] | 5 |
|
| 4 | could [not/n't] have have [noun] | 5 |
|
