| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been [prep] [det] | 781 |
|
| 2 | must [verb] been [prep] | 294 |
|
| 3 | must [verb] [prep] [det] | 270 |
|
| 4 | must [verb] been [det] | 93 |
|
