| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [det] [noun sg] | 872 |
|
| 2 | could have [det] [noun sg] | 66 |
|
| 3 | could have been [det] | 63 |
|
| 4 | could have been [noun sg] | 35 |
|
