| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [adv] [prep] [adj] | 17 |
|
| 2 | [modal v] [be] in [prep] [adj] | 17 |
|
| 3 | must [be] [adv prt] [prep] [adj] | 10 |
|
| 4 | must [be] in [prep] [adj] | 5 |
|
| 5 | must [be] in [prep] [adj] | 5 |
|
