| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] been [prep] [art] [noun] | 59 |
|
| 2 | must [verb] been [prep] [art] [noun] | 59 |
|
| 3 | [vb mod] [verb] been [prep] a [noun] | 47 |
|
| 4 | [modal v] [verb] been [prep] a [noun] | 47 |
|
| 5 | must [verb] been [prep] a [noun] | 16 |
|
| 6 | must [verb] be [prep] a [noun] | 16 |
|
| 7 | must [verb] [be] [prep] a [noun] | 16 |
|
| 8 | must [verb] been [prep] a [noun] | 16 |
|
| 9 | must [verb] [been] [prep] a [noun] | 16 |
|
