| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] have been [adj] | 9013 |
|
| 2 | [pron] must have been | 1980 |
|
| 3 | must have been [adj] | 760 |
|
| 4 | [pron] must have [adj] | 234 |
|
