| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] [been] [vb pp] for [det] years | 33 |
|
| 2 | [vb -s] been [vb pp] for [det] years | 33 |
|
| 3 | [vb -s] be [vb pp] for [det] years | 33 |
|
| 4 | has [be] [vb pp] for [det] years | 31 |
|
| 5 | [vb -s] [be] [vb pp] for many years | 24 |
|
| 6 | [vb -s] [be] [vb pp] for some years | 8 |
|
| 7 | [vb -s] [be] used for [det] years | 7 |
|
| 8 | [vb -s] [be] known for [det] years | 6 |
|
