| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] is impossible to be [adj] | 19 |
|
| 2 | it is impossible to be [adj] | 19 |
|
| 3 | it is impossible to be [adj] | 19 |
|
| 4 | [pron] is impossible to be certain | 7 |
|
| 5 | [pron] is impossible to be sure | 6 |
|
