| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] must be [vb pp] at [art] | 51 |
|
| 2 | [noun] must [be] [vb pp] at [art] | 51 |
|
| 3 | [noun] must [be] [vb pp] at the | 39 |
|
| 4 | [noun sg] must [be] [vb pp] at [art] | 37 |
|
| 5 | [noun pl] must [be] [vb pp] at [art] | 12 |
|
| 6 | [noun] must [be] [vb pp] at a | 7 |
|
