| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is not possible [to-vb] | 404 |
|
| 2 | is not always possible | 71 |
|
| 3 | not always possible [to-vb] | 49 |
|
| 4 | is always possible [to-vb] | 23 |
|
