| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been [adj] | 760 |
|
| 2 | [conj] have been [adj] | 535 |
|
| 3 | [conj] must have been | 89 |
|
| 4 | [conj] must have [adj] | 9 |
|
