| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have be [verb] a [adj] | 7 |
|
| 2 | must have be [verb] a [adj] | 7 |
|
| 3 | must have been [verb] a [adj] | 7 |
|
| 4 | must have be [vb pp] a [adj] | 5 |
|
