| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [adj] [verb] | 685 |
|
| 2 | must [be] [verb] at | 249 |
|
| 3 | [be] [adj] [verb] at | 217 |
|
| 4 | must [be] [adj] at | 26 |
|
