| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] [be] difficult for he | 5 |
|
| 2 | it [vb mod] [be] difficult for he | 5 |
|
| 3 | it [be] difficult for he [verb] | 10 |
|
| 4 | it [be] difficult for he [to-vb] | 10 |
|
