| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it can [be] difficult [verb] the | 6 |
|
| 2 | it can [be] difficult [verb] the | 6 |
|
| 3 | it can be difficult [verb] the | 6 |
|
| 4 | it can [be] difficult [to-vb] the | 5 |
|
