| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] which had been [vb pp] | 105 |
|
| 2 | [prep] which had be [vb pp] | 105 |
|
| 3 | of which had be [vb pp] | 92 |
|
| 4 | of which had be [vb pp] | 92 |
|
