| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] [verb] been a [noun] | 215 |
|
| 2 | it [modal v] [verb] been a [noun] | 215 |
|
| 3 | [pron] must [verb] been a [noun] | 126 |
|
| 4 | it must [verb] been [art] [noun] | 85 |
|
| 5 | it must [verb] been [art] [noun] | 85 |
|
| 6 | [pers pn] must [verb] been a [noun] | 71 |
|
| 7 | it must [verb] been a [noun] | 55 |
|
| 8 | it must [verb] been a [noun] | 51 |
|
| 9 | it must [verb] be a [noun] | 51 |
|
| 10 | it must [verb] [been] a [noun] | 51 |
|
| 11 | it must [verb] been a [noun] | 51 |
|
| 12 | it must [verb] [be] a [noun] | 51 |
|
