| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be impossible [verb] which | 12 |
|
| 2 | it [be] impossible [verb] which | 12 |
|
| 3 | it [be] impossible [verb] which | 12 |
|
| 4 | it [be] impossible [to-vb] which | 12 |
|
| 5 | it was impossible [verb] which | 6 |
|
| 6 | it [be] impossible to say which | 6 |
|
| 7 | it [was/were] impossible [verb] which | 6 |
|
| 8 | it [be] impossible say which | 6 |
|
| 9 | it [is] impossible [verb] which | 6 |
|
