| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | these [vb mod] have been [verb] | 20 |
|
| 2 | these [modal v] have been [verb] | 20 |
|
| 3 | these [modal v] have been [vb pp] | 20 |
|
| 4 | these may have been [verb] | 7 |
|
| 5 | these may have been [verb] | 7 |
|
