| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] for several [noun pl] | 17 |
|
| 2 | had been [vb pp] for several [noun] | 7 |
|
| 3 | have been [vb pp] for several year | 5 |
|
| 4 | have been [vb pp] for several years | 5 |
|
| 5 | have been [vb pp] for several [noun] | 5 |
|
