| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [be] [vb pp] [be] | 538 |
|
| 2 | [vb mod] [be] [vb pp] [be] | 538 |
|
| 3 | must [be] [verb] [be] | 43 |
|
| 4 | must [be] [vb pp] [be] | 42 |
|
| 5 | must [be] [vb pp] [be] | 42 |
|
