| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] be [prep] | 1380 |
|
| 2 | must [vb infin] [be] [prep] | 297 |
|
| 3 | must [vb infin] be [prep] | 297 |
|
| 4 | must [verb] be [prep] | 297 |
|
