| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [been] [det] [adj] | 15 |
|
| 2 | must have [been] [det] [adj] | 15 |
|
| 3 | must have been [det] [adj] | 15 |
|
| 4 | must have [been] many [adj] | 8 |
|
