| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to concentrate on | 852 |
|
| 2 | concentrated on | 695 |
|
| 3 | concentrating on | 674 |
|
| 4 | concentrate on | 526 |
|
| 5 | concentrate on | 477 |
|
| 6 | concentrates on | 314 |
|
| 7 | concentrated on | 265 |
|
