| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have [noun] | 22 |
|
| 2 | could [adv] have [noun sg] | 13 |
|
| 3 | could [adv] have [noun pl] | 8 |
|
| 4 | could still have [noun] | 5 |
|
