| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | concern has been [verb] over | 10 |
|
| 2 | concern have been [verb] over | 10 |
|
| 3 | concern have been [vb pp] over | 9 |
|
| 4 | concern have been expressed over | 7 |
|
| 5 | concern have been express over | 7 |
|
