| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be impossible for us [verb] | 9 |
|
| 2 | it be impossible [prep] us [verb] | 9 |
|
| 3 | it be impossible [prep] us [verb] | 9 |
|
| 4 | it be impossible [prep] us [to-vb] | 9 |
|
| 5 | it be impossible for us [verb] | 9 |
|
| 6 | it is impossible [prep] us [verb] | 6 |
|
