| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [art] [adj] | 1387 |
|
| 2 | must be [art] [adj] | 884 |
|
| 3 | must be [vb pp] [adj] | 306 |
|
| 4 | must be [vb pp] [art] | 160 |
|
