| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] [verb] [prep] | 868 |
|
| 2 | must [verb] [verb] [prep] | 867 |
|
| 3 | [modal v] [verb] [verb] at | 830 |
|
| 4 | must [verb] [verb] at | 64 |
|
