| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] not [verb] [been] possible | 68 |
|
| 2 | [vb mod] [verb] [been] possible for | 14 |
|
| 3 | not [verb] [been] possible for | 7 |
|
| 4 | [vb mod] not [verb] [been] for | 6 |
|
