| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it could [vb infin] been [det] | 19 |
|
| 2 | it could have been [det] | 19 |
|
| 3 | it could have been [det] | 18 |
|
| 4 | it could [verb] been any | 11 |
|
