| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] in recent years | 82 |
|
| 2 | been [v-ing] in recent years | 9 |
|
| 3 | been made in recent years | 6 |
|
| 4 | been make in recent years | 6 |
|
| 5 | been developed in recent years | 6 |
|
| 6 | been develop in recent years | 6 |
|
| 7 | been erode in recent years | 5 |
|
| 8 | been eroded in recent years | 5 |
|
