| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [be] [adj] | 353 |
|
| 2 | could have [be] [det] | 63 |
|
| 3 | [modal v] have [be] that | 31 |
|
| 4 | could [verb] [be] that | 13 |
|
| 5 | could have [be] that | 10 |
|
