| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [vb pp] [adj] | 306 |
|
| 2 | must [be] [vb pp] [adj] | 218 |
|
| 3 | [modal v] [be] [vb pp] clean | 19 |
|
| 4 | [vb mod] [be] [vb pp] clean | 19 |
|
| 5 | must [be] [verb] clean | 7 |
|
| 6 | must [be] [vb pp] clean | 7 |
|
| 7 | must [be] [vb pp] clean | 7 |
|
| 8 | must [be] [vb pp] clean | 7 |
|
