| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] on [pos pn] | 13902 |
|
| 2 | concentrate on [pron] | 429 |
|
| 3 | concentrate [prep] [pos pn] | 281 |
|
| 4 | concentrate [prep] [pos pn] | 281 |
|
| 5 | concentrate on [pos pn] | 262 |
|
