| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] from [noun] | 43 |
|
| 2 | must [be] [vb pp] from [noun sg] | 21 |
|
| 3 | must [be] [vb pp] from [noun pl] | 13 |
|
| 4 | must [be] [vb pp] from [noun prp] | 9 |
|
| 5 | must [be] protected from [noun] | 8 |
|
| 6 | must [be] obtained from [noun] | 7 |
|
