| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult for [pers pn] [to-vb] [pron] | 8 |
|
| 2 | be difficult for [pers pn] [to-vb] [pers pn] | 7 |
|
| 3 | be difficult for us [to-vb] [pron] | 6 |
|
| 4 | is difficult for [pers pn] [to-vb] [pron] | 6 |
|
| 5 | be difficult for [pers pn] [to-vb] [pos pn] | 5 |
|
