| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [been] [adj] [art] [noun] | 15 |
|
| 2 | must [verb] [been] [adj] [art] [noun] | 5 |
|
| 3 | must have [be] [adj] [art] [noun] | 5 |
|
| 4 | must have [been] [adj] [art] [noun] | 5 |
|
