| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] [noun] | 295 |
|
| 2 | have [vb pp] [noun] [verb] | 272 |
|
| 3 | could have [vb pp] [verb] | 125 |
|
| 4 | could have [noun] [verb] | 15 |
|
