| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] for this | 18 |
|
| 2 | has been [vb pp] for this | 16 |
|
| 3 | had been [vb pp] for this | 14 |
|
| 4 | have been used for this | 6 |
|
