| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [adv] [det] | 550 |
|
| 2 | could have been [adv] | 253 |
|
| 3 | could have been [det] | 63 |
|
| 4 | could have [adv] [det] | 18 |
|
