| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [adv] have [verb] | 11300 |
|
| 2 | [modal v] [adv] have [verb] | 11300 |
|
| 3 | could [adv] [verb] [verb] | 3862 |
|
| 4 | could [adv] have [verb] | 1825 |
|
