| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have been a | 152 |
|
| 2 | [Wh pn] had been a | 107 |
|
| 3 | [Wh pn] has been a | 31 |
|
| 4 | [Wh pn] 's been a | 8 |
|
