| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [verb] to be | 71 |
|
| 2 | must be [verb] to [be] | 71 |
|
| 3 | must [be] [vb pp] to [be] | 70 |
|
| 4 | must [be] seen to [be] | 32 |
|
| 5 | must [be] see to [be] | 32 |
|
| 6 | must [be] assume to [be] | 8 |
|
| 7 | must [be] assumed to [be] | 8 |
|
