| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | would have [been] [adj] | 2297 |
|
| 2 | [modal v] have [been] impossible | 83 |
|
| 3 | would have [been] impossible | 81 |
|
| 4 | would [vb infin] [been] impossible | 81 |
|
| 5 | would have [be] impossible | 81 |
|
| 6 | would [verb] [been] impossible | 81 |
|
