| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] a [adj] | 773 |
|
| 2 | could have [verb] a [adj] | 118 |
|
| 3 | could have been a [adj] | 77 |
|
| 4 | could have been [verb] [adj] | 29 |
|
| 5 | could have been [verb] a | 13 |
|
