| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] [prep] the | 1423 |
|
| 2 | must be [vb pp] [prep] the | 1423 |
|
| 3 | [modal v] be [vb pp] at the | 1002 |
|
| 4 | must be [vb pp] at [art] | 82 |
|
| 5 | must be [vb pp] at [art] | 82 |
|
| 6 | must be [verb] at the | 66 |
|
| 7 | must [be] [vb pp] at the | 63 |
|
| 8 | must be [vb pp] at the | 63 |
|
| 9 | must be [vb pp] at the | 63 |
|
