| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have been this | 16 |
|
| 2 | [modal v] have been this | 16 |
|
| 3 | [modal v] have been this | 16 |
|
| 4 | may have been this | 6 |
|
| 5 | may have been this | 6 |
|
