| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult for [pers pn] [to-vb] | 106 |
|
| 2 | [adv] difficult for [pers pn] [to-vb] | 101 |
|
| 3 | be [adv] difficult for [pers pn] | 98 |
|
| 4 | be [adv] for [pers pn] [to-vb] | 69 |
|
