| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must have been [adv] for | 5 |
|
| 2 | [pers pn] must have been [adv] for | 5 |
|
| 3 | must have been [adv] [adj] for | 24 |
|
| 4 | must have been [adv] [adj] for | 22 |
|
