| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] be impossible to be [adj] | 30 |
|
| 2 | it be impossible to be [adj] | 30 |
|
| 3 | it be impossible to be [adj] | 30 |
|
| 4 | [pron] is impossible to be [adj] | 19 |
|
| 5 | [pron] be impossible to be sure | 9 |
|
| 6 | [pron] was impossible to be [adj] | 7 |
|
| 7 | [pron] be impossible to be certain | 7 |
|
