| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] at [art] [adj] | 815 |
|
| 2 | must be [vb pp] at [art] | 82 |
|
| 3 | must be [vb pp] [art] [adj] | 71 |
|
| 4 | must be [vb pp] at [adj] | 60 |
|
