| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [vb pp] to [be] | 102 |
|
| 2 | had been [vb pp] to be | 102 |
|
| 3 | had been found to [be] | 28 |
|
| 4 | had been shown to [be] | 13 |
|
