| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must [verb] been a [noun] | 126 |
|
| 2 | [Wh det] [modal v] [verb] been a [noun] | 42 |
|
| 3 | [Wh det] [vb mod] [verb] been a [noun] | 42 |
|
| 4 | [Wh det] must [verb] been [art] [noun] | 9 |
|
| 5 | [Wh det] must [verb] been [art] [noun] | 9 |
|
| 6 | [Wh det] must [verb] be a [noun] | 5 |
|
| 7 | [Wh det] must [verb] [been] a [noun] | 5 |
|
| 8 | [Wh det] must [verb] been a [noun] | 5 |
|
| 9 | [Wh det] must [verb] [be] a [noun] | 5 |
|
| 10 | [Wh det] must [verb] been a [noun] | 5 |
|
