| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have been [prep] some | 18 |
|
| 2 | [modal v] have been [prep] some | 18 |
|
| 3 | [modal v] have been in some | 9 |
|
| 4 | must have been [prep] some | 6 |
|
| 5 | must have been [prep] some | 6 |
|
