| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be impossible for us [verb] | 12 |
|
| 2 | be impossible [prep] us [verb] | 12 |
|
| 3 | be impossible [prep] us [verb] | 12 |
|
| 4 | be impossible for us [verb] | 12 |
|
| 5 | be impossible [prep] us [to-vb] | 12 |
|
| 6 | is impossible [prep] us [verb] | 6 |
|
