| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] must [verb] been [vb pp] for | 10 |
|
| 2 | [noun sg] must [verb] been [vb pp] for | 6 |
|
| 3 | must [verb] been [vb pp] for [adj] | 5 |
|
