| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it be difficult for [pron] | 7 |
|
| 2 | [subord] it [be] difficult for [pers pn] | 7 |
|
| 3 | [subord] it [is] difficult for [pron] | 6 |
|
| 4 | [subord] it is difficult for [pron] | 5 |
|
