| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] at [noun sg] | 15 |
|
| 2 | must [be] [vb pp] at [noun sg] | 15 |
|
| 3 | must [be] [vb pp] at court | 6 |
|
| 4 | must [be] filed at [noun sg] | 6 |
|
