| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [modal v] [be] [verb] | 29 |
|
| 2 | is [vb mod] [be] [verb] | 29 |
|
| 3 | [be] must [be] [verb] | 9 |
|
| 4 | be must [be] [verb] | 9 |
|
| 5 | [is] must [be] [verb] | 8 |
|
| 6 | is must [be] [verb] | 6 |
|
