| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [verb] be possible | 70 |
|
| 2 | not [verb] been possible | 69 |
|
| 3 | not [vb infin] [be] possible | 69 |
|
| 4 | not [verb] [been] possible | 69 |
|
| 5 | not have [be] possible | 69 |
|
| 6 | not have [be] possible | 69 |
|
| 7 | not [verb] [be] possible | 67 |
|
