| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [verb] | 170330 |
|
| 2 | must be [verb] | 12068 |
|
| 3 | must [be] [verb] | 12068 |
|
| 4 | must [be] [verb] | 12065 |
|
