| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] not been possible | 52 |
|
| 2 | [vb -s] not [been] possible | 52 |
|
| 3 | [vb -s] not be possible | 52 |
|
| 4 | has not [be] possible | 51 |
|
| 5 | [vb -s] not [be] possible | 49 |
|
