| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been [det] [noun] | 173 |
|
| 2 | must have been [adj] [noun] | 120 |
|
| 3 | must have [be] [det] [noun] | 50 |
|
| 4 | must have [been] [det] [noun] | 50 |
|
| 5 | must have be [det] [noun] | 50 |
|
| 6 | must [verb] been [det] [noun] | 50 |
|
