| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it could [verb] been [det] [noun] | 7 |
|
| 2 | it could [vb infin] been [det] [noun] | 7 |
|
| 3 | it could have been [det] [noun] | 7 |
|
| 4 | it could have been [det] [noun] | 6 |
|
| 5 | it could [verb] been [det] [noun sg] | 6 |
|
| 6 | it could [verb] been any [noun] | 5 |
|
