| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [verb] [adv] [noun] | 5 |
|
| 2 | could have [verb] [adv] [noun] | 5 |
|
| 3 | could [verb] [verb] [adv] [noun] | 5 |
|
| 4 | could [verb] [vb pp] [adv] [noun] | 5 |
|
| 5 | could [vb infin] [verb] [adv] [noun] | 5 |
|
