| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who has been [verb] [prep] a | 26 |
|
| 2 | who has [been] [vb pp] [prep] a | 22 |
|
| 3 | who has [been] [verb] by a | 6 |
|
| 4 | who has [been] [verb] as a | 5 |
|
