| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] at [art] [noun] | 1550 |
|
| 2 | must be [vb pp] at [art] | 82 |
|
| 3 | must be [vb pp] [art] [noun] | 80 |
|
| 4 | must be [vb pp] at [noun] | 28 |
|
| 5 | must be at [art] [noun] | 19 |
|
