| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] difficult for [pers pn] [to-vb] [prep] | 7 |
|
| 2 | [pers pn] difficult for [pron] [to-vb] [prep] | 7 |
|
| 3 | it difficult for [pron] [to-vb] [prep] | 7 |
|
