| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] at [art] | 82 |
|
| 2 | must be [vb pp] at [art] | 82 |
|
| 3 | must be [vb pp] at the | 63 |
|
| 4 | must be [vb pp] at a | 9 |
|
| 5 | must be [vb pp] at an | 7 |
|
| 6 | must be made at [art] | 6 |
|
