| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it could [vb infin] been in | 6 |
|
| 2 | it could have been in | 6 |
|
| 3 | it could [verb] been in | 6 |
|
| 4 | it could [verb] been in | 6 |
|
| 5 | it could have been in | 6 |
|
