| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been in [det] | 30 |
|
| 2 | must have been [prep] [det] | 26 |
|
| 3 | must have been in [adj] | 16 |
|
| 4 | must have been in [det] | 5 |
|
| 5 | must have [been] in [det] | 5 |
|
| 6 | must [verb] been in [det] | 5 |
|
| 7 | must have [be] in [det] | 5 |
|
| 8 | must have be in [det] | 5 |
|
| 9 | must [vb infin] been in [det] | 5 |
|
