| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] [art] [noun] | 557 |
|
| 2 | have [vb pp] [art] [noun] [verb] | 429 |
|
| 3 | could have [art] [noun] [verb] | 25 |
|
| 4 | could have [vb pp] [noun] [verb] | 19 |
|
