| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [verb] on | 665 |
|
| 2 | [modal v] be concentrate on | 53 |
|
| 3 | should be concentrate [prep] | 21 |
|
| 4 | should be concentrate [prep] | 21 |
|
| 5 | should be concentrate on | 15 |
|
| 6 | should [be] concentrate on | 15 |
|
| 7 | should be concentrate on | 15 |
|
| 8 | should [be] concentrate on | 15 |
|
