| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [prep] be [adv] | 403 |
|
| 2 | [modal v] [prep] be [adv] | 403 |
|
| 3 | must [prep] be [adv] | 13 |
|
| 4 | must [prep] [be] [adv] | 13 |
|
