| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [verb] | 32838 |
|
| 2 | [adv] have [verb] | 23634 |
|
| 3 | could have [verb] | 5379 |
|
| 4 | could [adv] have | 3257 |
|
