| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have been [noun] of | 5 |
|
| 2 | could [verb] been [noun] of | 5 |
|
| 3 | could have been [noun] of | 5 |
|
| 4 | could [vb infin] been [noun] of | 5 |
|
| 5 | could [verb] been [noun] of | 5 |
|
