| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] for [det] | 568 |
|
| 2 | must have been [verb] for | 36 |
|
| 3 | must have been [verb] [det] | 17 |
|
| 4 | must have [verb] for [det] | 6 |
|
