| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [be] [verb] | 1134 |
|
| 2 | could [be] [verb] be | 73 |
|
| 3 | have [be] [verb] be | 25 |
|
| 4 | could have [verb] be | 10 |
|
