| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] concerned [adv] | 5 |
|
| 2 | has been concerned [adv] | 5 |
|
| 3 | has be concerned [adv] | 5 |
|
| 4 | has [be] concerned [adv] | 5 |
|
