| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have [be] [verb] | 7122 |
|
| 2 | [modal v] have [be] [verb] | 7122 |
|
| 3 | could [verb] [be] [verb] | 1297 |
|
| 4 | could have [be] [verb] | 1154 |
|
