| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] must be | 749 |
|
| 2 | [vb pp] must be | 174 |
|
| 3 | [vb pp] [conj] must | 54 |
|
| 4 | [vb pp] [conj] be | 54 |
|
