| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [verb] [prep] [art] | 2090 |
|
| 2 | must [be] [verb] [prep] [art] | 2090 |
|
| 3 | [vb mod] [be] [verb] at [art] | 1556 |
|
| 4 | [modal v] [be] [verb] at [art] | 1556 |
|
| 5 | must [be] [verb] at [art] | 88 |
|
| 6 | must [be] [verb] at [art] | 88 |
|
| 7 | must [be] [verb] at [art] | 88 |
|
| 8 | must [be] [verb] at [art] | 88 |
|
