| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult for [pers pn] [to-vb] | 279 |
|
| 2 | [pron] for [pers pn] [to-vb] | 136 |
|
| 3 | [pron] difficult for [pers pn] | 75 |
|
