| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [vb pp] | 31868 |
|
| 2 | had [vb pp] [det] | 4878 |
|
| 3 | been [vb pp] [det] | 831 |
|
| 4 | had been [det] | 529 |
|
