| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [Wh det] [be] [verb] | 180 |
|
| 2 | must [vb infin] [pron] [be] [verb] | 52 |
|
| 3 | must [verb] [Wh det] [be] [verb] | 14 |
|
