| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been in [noun] | 141 |
|
| 2 | must have been [prep] [noun] | 39 |
|
| 3 | must have be in [noun] | 20 |
|
| 4 | must have [been] in [noun] | 20 |
|
| 5 | must have [be] in [noun] | 20 |
|
| 6 | must [verb] been in [noun] | 20 |
|
