| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [be] [verb] on | 665 |
|
| 2 | should [be] keep [prep] | 147 |
|
| 3 | should [be] keep [prep] | 147 |
|
| 4 | [modal v] [be] keep on | 38 |
|
| 5 | should [be] keep on | 13 |
|
