| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] [vb pp] to have been [prep] | 7 |
|
| 2 | [vb infin] [vb pp] [to-vb] been [prep] | 7 |
|
| 3 | have [vb pp] [to-vb] been [prep] | 6 |
|
