| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] difficult for [indef pn] | 11 |
|
| 2 | [be] difficult for [indef pn] [to-vb] | 10 |
|
| 3 | it [be] for [indef pn] [to-vb] | 5 |
|
