| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [verb] been [adv] a [noun] | 35 |
|
| 2 | [modal v] [verb] been [adv] a [noun] | 35 |
|
| 3 | must [verb] been [adv] [art] [noun] | 24 |
|
| 4 | must [verb] been [adv] [art] [noun] | 24 |
|
| 5 | must [verb] been [adv] a [noun] | 22 |
|
| 6 | must [verb] be [adv] a [noun] | 18 |
|
| 7 | must [verb] [been] [adv] a [noun] | 18 |
|
| 8 | must [verb] [be] [adv] a [noun] | 18 |
|
| 9 | must [verb] been [adv] a [noun] | 18 |
|
