| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] been a [noun] | 181 |
|
| 2 | [det] [verb] been a [noun] | 82 |
|
| 3 | [det] must [verb] been a | 24 |
|
| 4 | [det] must [verb] a [noun] | 16 |
|
| 5 | [det] must [verb] been [noun] | 9 |
|
