| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [verb] [prep] [adj] | 1000 |
|
| 2 | [vb mod] [be] [verb] [prep] first | 40 |
|
| 3 | [modal v] [be] [verb] [prep] first | 40 |
|
| 4 | must [be] [verb] [prep] first | 5 |
|
| 5 | must [be] [verb] [prep] first | 5 |
|
