| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not be possible [to-vb] | 117 |
|
| 2 | not always possible [to-vb] | 49 |
|
| 3 | not always be possible | 22 |
|
| 4 | always be possible [to-vb] | 12 |
|
