| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] up the | 25 |
|
| 2 | must [verb] up the | 25 |
|
| 3 | must [vb infin] up the | 25 |
|
| 4 | must [verb] up the | 25 |
|
| 5 | must keep up the | 5 |
|
| 6 | must keep up the | 5 |
|
