| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] must [be] [vb pp] at [adj] | 8 |
|
| 2 | [noun pl] must [be] [vb pp] at [adj] | 5 |
|
| 3 | must [be] [vb pp] at [art] [adj] | 17 |
|
| 4 | must [be] [vb pp] at [art] [adj] | 17 |
|
| 5 | must [be] [vb pp] at the [adj] | 8 |
|
| 6 | must [be] [vb pp] at a [adj] | 8 |
|
| 7 | must [be] [vb pp] at the [adj] | 8 |
|
| 8 | must [be] [vb pp] at an [adj] | 5 |
|
| 9 | must [be] [vb pp] at [adj] [noun] | 5 |
|
