| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [vb pp] [prep] | 4919 |
|
| 2 | must [be] [vb pp] [conj] | 1532 |
|
| 3 | [be] [vb pp] [conj] [prep] | 1218 |
|
| 4 | must [be] [conj] [prep] | 7 |
|
