| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have been at [det] | 13 |
|
| 2 | [modal v] have been at [det] | 13 |
|
| 3 | must have been at [det] | 5 |
|
| 4 | must have been at [det] | 5 |
|
| 5 | [modal v] have been at that | 5 |
|
