| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] for several years | 15 |
|
| 2 | [be] [vb pp] for several years | 7 |
|
| 3 | be [vb pp] for several years | 7 |
|
| 4 | [been] [vb pp] for several years | 6 |
|
| 5 | been [vb pp] for several years | 6 |
|
