| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been [prep] this | 23 |
|
| 2 | [vb mod] have been [prep] this | 23 |
|
| 3 | must have been [prep] this | 8 |
|
| 4 | must have been [prep] this | 8 |
|
| 5 | [modal v] have been in this | 7 |
|
| 6 | may have been [prep] this | 5 |
|
| 7 | may have been [prep] this | 5 |
|
