| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [verb] been a [noun] | 221 |
|
| 2 | must [verb] been a [noun] | 181 |
|
| 3 | must [adv] [verb] a [noun] | 71 |
|
| 4 | must [adv] [verb] been a | 19 |
|
| 5 | must [adv] [verb] been [noun] | 5 |
|
