| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been [adj] for | 47 |
|
| 2 | must [vb infin] been [adj] for | 47 |
|
| 3 | must have been [adj] for | 47 |
|
| 4 | must [verb] been terrible for | 5 |
|
| 5 | must [verb] been responsible for | 5 |
|
