| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] be | 3545 |
|
| 2 | must [verb] [be] | 3545 |
|
| 3 | [modal v] [verb] are | 163 |
|
| 4 | must [verb] [am/are] | 7 |
|
