| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] for many years | 50 |
|
| 2 | has been [vb pp] for [det] years | 31 |
|
| 3 | had been [vb pp] for [det] years | 18 |
|
| 4 | have been [vb pp] for [det] years | 16 |
|
| 5 | have been known for [det] years | 15 |
|
| 6 | have been [vb pp] for some years | 15 |
|
| 7 | have been used for [det] years | 12 |
|
| 8 | have been [vb pp] for several years | 5 |
|
