| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] must be [vb pp] at | 134 |
|
| 2 | [noun] must be [vb pp] [art] | 83 |
|
| 3 | must be [vb pp] at [art] | 82 |
|
| 4 | [noun] must be at [art] | 13 |
|
| 5 | [noun] be [vb pp] at [art] | 12 |
|
