| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] must [be] [vb pp] | 184 |
|
| 2 | is [verb] [be] [vb pp] | 129 |
|
| 3 | is [verb] must [be] | 28 |
|
| 4 | is must [be] [vb pp] | 6 |
|
