| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [been] [vb pp] in a | 12 |
|
| 2 | could have [been] [verb] in a | 12 |
|
| 3 | could have been [verb] in a | 12 |
|
| 4 | could have [been] [verb] in a | 12 |
|
