| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is difficult for [pers pn] [to-vb] | 41 |
|
| 2 | is difficult for us [verb] | 13 |
|
| 3 | is difficult for them [verb] | 12 |
|
| 4 | is difficult for me [verb] | 6 |
|
