| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [verb] been [prep] | 83 |
|
| 2 | it [verb] been one [prep] | 45 |
|
| 3 | must [verb] been one [prep] | 35 |
|
| 4 | it must [verb] been one | 9 |
|
