| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] [prep] a | 1700 |
|
| 2 | had previously been [verb] [prep] | 92 |
|
| 3 | previously been [verb] [prep] a | 23 |
|
| 4 | had previously [verb] [prep] a | 15 |
|
