| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is concerned with [v-ing] | 12 |
|
| 2 | it is concerned with [v-ing] | 12 |
|
| 3 | it is concerned [prep] [v-ing] | 12 |
|
| 4 | it is concerned [prep] [v-ing] | 12 |
|
