| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [adv] [verb] been a [noun] | 147 |
|
| 2 | [vb mod] [adv] [verb] been a [noun] | 147 |
|
| 3 | must [adv] [verb] been [art] [noun] | 17 |
|
| 4 | must [adv] [verb] been [art] [noun] | 17 |
|
| 5 | must [adv] [verb] [be] a [noun] | 9 |
|
| 6 | must [adv] [verb] been a [noun] | 9 |
|
| 7 | must [adv] [verb] been a [noun] | 9 |
|
| 8 | must [adv] [verb] [been] a [noun] | 9 |
|
| 9 | must [adv] [verb] be a [noun] | 9 |
|
