| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it difficult for [pron] [to-vb] | 65 |
|
| 2 | difficult for [pron] [to-vb] [adv] | 41 |
|
| 3 | it for [pron] [to-vb] [adv] | 6 |
|
