| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] [prep] [pron] [to-vb] | 329 |
|
| 2 | [be] impossible [prep] [pron] [to-vb] | 70 |
|
| 3 | be impossible [prep] [pron] [to-vb] | 70 |
|
| 4 | [is] impossible [prep] [pron] [to-vb] | 32 |
|
| 5 | is impossible [prep] [pron] [verb] | 24 |
|
