| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adj] [verb] [adj] | 1841 |
|
| 2 | it be impossible [verb] [adj] | 126 |
|
| 3 | it [be] impossible [verb] [adj] | 126 |
|
| 4 | it [is] impossible [verb] [adj] | 92 |
|
| 5 | [pron] is impossible [verb] [adj] | 86 |
|
