| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [vb pp] over the | 70 |
|
| 2 | [vb -s] been expressed over the | 7 |
|
| 3 | 's been [vb pp] over the | 5 |
|
| 4 | [vb -s] been developed over the | 5 |
|
