| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [been] [adj] | 760 |
|
| 2 | [modal v] have [been] some | 104 |
|
| 3 | must have [been] [det] | 93 |
|
| 4 | must have [be] some | 43 |
|
| 5 | must have [been] some | 43 |
|
| 6 | must [verb] [been] some | 43 |
|
