| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] [pron] at | 731 |
|
| 2 | must [verb] [pron] [prep] | 440 |
|
| 3 | must [verb] [pron] [prep] | 440 |
|
| 4 | must [verb] [pron] at | 19 |
|
