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