| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been [vb pp] [num] years before | 10 |
|
| 2 | [vb past] been [vb pp] [num] years before | 10 |
|
| 3 | have been [vb pp] [num] years before | 10 |
|
| 4 | had been [vb pp] [num] years before | 10 |
|
