| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] must be | 73 |
|
| 2 | [be] [vb pp] and must | 21 |
|
| 3 | [vb pp] and must be | 21 |
|
| 4 | [be] [vb pp] and be | 19 |
|
