| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] be impossible for | 41 |
|
| 2 | it [modal v] [vb infin] be impossible | 30 |
|
| 3 | it [modal v] [vb infin] be for | 14 |
|
| 4 | [modal v] [vb infin] be impossible for | 12 |
|
