| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [art] [noun] | 2060 |
|
| 2 | must be [art] [noun] | 1194 |
|
| 3 | must be [vb pp] [art] | 160 |
|
| 4 | must be [vb pp] [noun] | 58 |
|
