| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] [adv] at | 826 |
|
| 2 | must [verb] [adv] [prep] | 671 |
|
| 3 | must [verb] [adv] [prep] | 671 |
|
| 4 | must [verb] [adv] at | 45 |
|
