| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] for many years [prep] | 21 |
|
| 2 | been [vb pp] for many years [prep] | 17 |
|
| 3 | [been] [vb pp] for many years [prep] | 17 |
|
| 4 | [be] used for many years [prep] | 8 |
|
| 5 | [be] [vb pp] for many years in | 6 |
|
