| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] have been [adj] | 1253 |
|
| 2 | could [adv] have been | 981 |
|
| 3 | could have been [adj] | 178 |
|
| 4 | could [adv] have [adj] | 27 |
|
