| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] at [adj] | 1517 |
|
| 2 | must be [vb pp] [adj] | 306 |
|
| 3 | must be [vb pp] at | 229 |
|
| 4 | must be at [adj] | 8 |
|
