| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] in recent years | 82 |
|
| 2 | been made [prep] recent years | 6 |
|
| 3 | been developed [prep] recent years | 6 |
|
| 4 | been eroded [prep] recent years | 5 |
|
| 5 | been [vb pp] over recent years | 5 |
|
