| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been [adv] a [noun] | 211 |
|
| 2 | must [verb] been a [noun] | 181 |
|
| 3 | must [verb] [adv] a [noun] | 28 |
|
| 4 | must [verb] been [adv] a | 28 |
|
