| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [prep] recent years | 5 |
|
| 2 | [verb] been [prep] recent years | 5 |
|
| 3 | been [verb] [prep] recent years | 96 |
|
| 4 | been [vb pp] [prep] recent years | 87 |
|
| 5 | been [adj] [prep] recent years | 12 |
|
| 6 | been [adj] [prep] recent years | 12 |
|
| 7 | been [v-ing] [prep] recent years | 9 |
|
| 8 | been make [prep] recent years | 6 |
|
| 9 | been develop [prep] recent years | 6 |
|
| 10 | been made [prep] recent years | 6 |
|
| 11 | been developed [prep] recent years | 6 |
|
| 12 | been eroded [prep] recent years | 5 |
|
| 13 | been erode [prep] recent years | 5 |
|
