| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult for [pron] [to-vb] | 110 |
|
| 2 | [pron] difficult for [pron] [to-vb] | 65 |
|
| 3 | [pron] [adv] difficult for [pron] | 45 |
|
| 4 | [pron] [adv] for [pron] [to-vb] | 41 |
|
