| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have been [adj] | 346 |
|
| 2 | could have been [det] | 62 |
|
| 3 | [modal v] have been that | 30 |
|
| 4 | [vb mod] have been that | 30 |
|
| 5 | could have [be] that | 10 |
|
| 6 | could have been that | 10 |
|
| 7 | could have been that | 10 |
|
| 8 | could have be that | 10 |
|
| 9 | could [vb infin] been that | 10 |
|
| 10 | could have [been] that | 10 |
|
| 11 | could have been that | 10 |
|
| 12 | could [verb] been that | 10 |
|
