| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [be] [verb] | 1134 |
|
| 2 | [modal v] have [be] see | 44 |
|
| 3 | could [verb] [be] see | 7 |
|
| 4 | could [vb infin] [be] see | 7 |
|
| 5 | could have [be] see | 5 |
|
