| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been [verb] [prep] a | 5421 |
|
| 2 | had been [verb] [prep] a | 1700 |
|
| 3 | [verb] had been [verb] [prep] | 130 |
|
| 4 | [verb] had [verb] [prep] a | 10 |
|
