| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [verb] [art] [noun] | 576 |
|
| 2 | could have [vb pp] [art] [noun] | 574 |
|
| 3 | [modal v] have had [art] [noun] | 459 |
|
| 4 | could [verb] had [art] [noun] | 59 |
|
| 5 | could have have [art] [noun] | 59 |
|
