| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [vb pp] [prep] [verb] | 3446 |
|
| 2 | must [be] [verb] [prep] [verb] | 149 |
|
| 3 | must [be] [vb pp] [prep] [verb] | 148 |
|
