| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [vb pp] for many years | 24 |
|
| 2 | has been used for [det] years | 7 |
|
| 3 | has been [vb pp] for some years | 6 |
|
| 4 | has been known for [det] years | 6 |
|
