| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] concentrate on | 584 |
|
| 2 | 've [verb] on | 320 |
|
| 3 | have concentrate on | 253 |
|
| 4 | [vb base] concentrate on | 210 |
|
| 5 | 've concentrate [prep] | 8 |
|
| 6 | 've concentrate on | 8 |
|
| 7 | 've concentrate [prep] | 8 |
|
