| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [verb] to | 714 |
|
| 2 | must [be] [vb pp] to | 682 |
|
| 3 | [modal v] [be] seen to | 169 |
|
| 4 | [vb mod] [be] seen to | 169 |
|
| 5 | must [be] seen [prep] | 131 |
|
| 6 | must [be] seen to | 32 |
|
| 7 | must [be] see to | 32 |
|
| 8 | must [be] seen to | 32 |
|
