| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] concentrate on [v-ing] | 62 |
|
| 2 | it [verb] on [v-ing] | 23 |
|
| 3 | it concentrate [prep] [v-ing] | 5 |
|
| 4 | it concentrate on [verb] | 5 |
|
