| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | would [vb infin] [been] impossible for | 12 |
|
| 2 | would have [been] impossible for | 12 |
|
| 3 | would have [been] impossible for | 12 |
|
| 4 | would [verb] [been] impossible for | 12 |
|
| 5 | would [verb] been impossible for | 12 |
|
