| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have been [prep] [det] | 21 |
|
| 2 | could have been in [adj] | 14 |
|
| 3 | could have been [prep] any | 9 |
|
| 4 | could have been [prep] any | 9 |
|
| 5 | could have been [prep] [adj] | 8 |
|
