| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] [num] years | 55 |
|
| 2 | have [vb pp] [num] years before | 21 |
|
| 3 | been [vb pp] [num] years before | 11 |
|
| 4 | have been [num] years before | 5 |
|
