| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] impossible [to-vb] [adj] | 126 |
|
| 2 | it [be] impossible [to-vb] [conj] | 99 |
|
| 3 | [be] impossible [to-vb] [conj] [adj] | 17 |
|
| 4 | it [be] [to-vb] [conj] [adj] | 11 |
|
