| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [verb] [adv] | 352 |
|
| 2 | could have [verb] [noun] | 298 |
|
| 3 | could [verb] [adv] [noun] | 96 |
|
| 4 | have [verb] [adv] [noun] | 77 |
|
