| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | concentrate on [det] [noun] | 84 |
|
| 2 | [modal v] concentrate on [noun] | 63 |
|
| 3 | [modal v] concentrate on [det] | 22 |
|
| 4 | [modal v] on [det] [noun] | 12 |
|
