| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] been a [noun] | 378 |
|
| 2 | must [verb] been a [noun] | 181 |
|
| 3 | it must [verb] been a | 136 |
|
| 4 | it must [verb] a [noun] | 54 |
|
| 5 | it must [verb] been [noun] | 41 |
|
