| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not have been for | 6 |
|
| 2 | [modal v] not have [been] for | 6 |
|
| 3 | [modal v] not have [been] for | 6 |
|
| 4 | [vb mod] not have [been] for | 6 |
|
| 5 | could not have [been] for | 5 |
|
| 6 | could not have [been] for | 5 |
|
