| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] to have been [verb] an | 7 |
|
| 2 | to have been [verb] [prep] an | 32 |
|
| 3 | to have been [verb] [prep] an | 32 |
|
| 4 | to have been [verb] by an | 15 |
|
| 5 | to have been [verb] by an | 15 |
|
