| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [prep] | 1101 |
|
| 2 | must [be] [prep] | 1101 |
|
| 3 | [modal v] [be] to | 431 |
|
| 4 | [vb mod] [be] to | 431 |
|
| 5 | must [be] to | 38 |
|
| 6 | must [be] to | 38 |
|
