| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [prep] this [noun sg] | 159 |
|
| 2 | concerned [prep] this [noun sg] | 53 |
|
| 3 | been concerned [prep] [noun sg] | 11 |
|
| 4 | been concerned [prep] this | 6 |
|
