| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] difficult for [pron] | 78 |
|
| 2 | it difficult for [pron] [to-vb] | 65 |
|
| 3 | [is] difficult for [pron] [to-vb] | 58 |
|
| 4 | it [is] for [pron] [to-vb] | 57 |
|
