| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult for [pron] [to-vb] | 107 |
|
| 2 | it difficult for [pron] [to-vb] | 65 |
|
| 3 | it [adv] difficult for [pron] | 44 |
|
| 4 | it [adv] for [pron] [to-vb] | 16 |
|
