| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] [prep] recent years by | 14 |
|
| 2 | been [verb] [prep] recent years by | 14 |
|
| 3 | been [verb] [prep] recent years by | 14 |
|
| 4 | been [verb] in recent years by | 13 |
|
| 5 | been [verb] in recent years by | 13 |
|
