| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have been [verb] in a | 26 |
|
| 2 | [Wh det] have been [vb pp] in a | 25 |
|
| 3 | [Wh det] had been [verb] in a | 17 |
|
| 4 | [Wh det] has been [verb] in a | 7 |
|
