| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have been a | 173 |
|
| 2 | [Wh pn] have been a | 154 |
|
| 3 | [Wh pn] had been a | 120 |
|
| 4 | [Wh pn] has been a | 37 |
|
| 5 | [Wh pn] have been an | 21 |
|
| 6 | [Wh pn] 's been a | 8 |
|
| 7 | [Wh pn] 'd been a | 5 |
|
| 8 | [Wh pn] have been a | 5 |
|
