| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been [verb] over many years | 11 |
|
| 2 | have been [verb] over many years | 11 |
|
| 3 | has been [verb] over many years | 6 |
|
| 4 | [vb -s] been [verb] over many years | 6 |
|
| 5 | have been [verb] over many years | 5 |
|
| 6 | [vb base] been [verb] over many years | 5 |
|
