| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] must have been for | 6 |
|
| 2 | [pers pn] must [vb infin] been for | 6 |
|
| 3 | it must [verb] been for | 6 |
|
| 4 | [pers pn] must have been for | 6 |
|
