| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not have been | 1491 |
|
| 2 | [modal v] have been [prep] | 1264 |
|
| 3 | not have been [prep] | 78 |
|
| 4 | [modal v] not have [prep] | 58 |
|
