| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have been [prep] | 99 |
|
| 2 | could have [been] in | 41 |
|
| 3 | could have [been] at | 11 |
|
| 4 | could have [been] on | 10 |
|
| 5 | could have [been] of | 9 |
|
| 6 | could have [been] from | 5 |
|
