| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [adj] for [indef pn] | 95 |
|
| 2 | it be impossible for [pron] | 76 |
|
| 3 | [pron] be impossible for [indef pn] | 11 |
|
| 4 | it [be] impossible for [indef pn] | 11 |
|
| 5 | it be impossible [prep] [indef pn] | 11 |
|
