| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | concentrate on [verb] [prep] the | 14 |
|
| 2 | concentrate on [v-ing] [prep] the | 14 |
|
| 3 | concentrate on [verb] for the | 5 |
|
| 4 | to concentrate on [verb] [prep] the | 5 |
|
| 5 | concentrate on [verb] for the | 5 |
|
