| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [adj] [noun sg] | 2000 |
|
| 2 | must have been [adj] | 760 |
|
| 3 | must have [adj] [noun sg] | 204 |
|
| 4 | must have been [noun sg] | 47 |
|
