| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] for [det] years | 77 |
|
| 2 | been [vb pp] [prep] many years | 68 |
|
| 3 | been [vb pp] [prep] some years | 17 |
|
| 4 | been known [prep] [det] years | 15 |
|
| 5 | been used [prep] [det] years | 14 |
|
| 6 | been [vb pp] over [det] years | 12 |
|
| 7 | been [vb pp] [prep] several years | 6 |
|
| 8 | been established [prep] [det] years | 5 |
|
