| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] [prep] many years | 62 |
|
| 2 | have been [vb pp] for many years | 50 |
|
| 3 | has been [vb pp] [prep] many years | 30 |
|
| 4 | have been [vb pp] [prep] many years | 17 |
|
| 5 | had been [vb pp] [prep] many years | 11 |
|
| 6 | have been [vb pp] over many years | 11 |
|
| 7 | have been used [prep] many years | 11 |
|
| 8 | have been known [prep] many years | 10 |
|
