| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult for [pers pn] [to-vb] | 106 |
|
| 2 | [pron] be difficult for [pers pn] | 90 |
|
| 3 | [pron] be for [pers pn] [to-vb] | 81 |
|
| 4 | [pron] difficult for [pers pn] [to-vb] | 63 |
|
