| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] for several | 87 |
|
| 2 | [be] [vb pp] for years | 59 |
|
| 3 | [vb pp] for several years | 48 |
|
| 4 | [be] [vb pp] several years | 26 |
|
