| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] have been [verb] a | 917 |
|
| 2 | [pron] could have been [verb] | 405 |
|
| 3 | [pron] could have [verb] a | 210 |
|
| 4 | [pron] could have been a | 187 |
|
| 5 | could have been [verb] a | 16 |
|
