| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] difficult [to-vb] that | 132 |
|
| 2 | it [be] difficult not [to-vb] | 38 |
|
| 3 | [be] difficult not [to-vb] that | 7 |
|
| 4 | it [be] not [to-vb] that | 5 |
|
