| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [verb] to | 714 |
|
| 2 | must [be] [vb pp] to | 682 |
|
| 3 | must [be] held [prep] | 37 |
|
| 4 | must [be] held [prep] | 37 |
|
| 5 | [modal v] [be] held to | 34 |
|
| 6 | must [be] hold to | 6 |
|
| 7 | must [be] held to | 6 |
|
