| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been [noun] | 673 |
|
| 2 | [vb mod] have been [noun] | 673 |
|
| 3 | must have [be] [noun] | 121 |
|
| 4 | must have be [noun] | 121 |
|
| 5 | must have [been] [noun] | 120 |
|
| 6 | must have been [noun] | 120 |
|
| 7 | must [verb] been [noun] | 120 |
|
