| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] been [prep] | 294 |
|
| 2 | [verb] been [prep] some | 116 |
|
| 3 | must [verb] been some | 43 |
|
| 4 | must [verb] [prep] some | 41 |
|
