| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it difficult for [pron] [to-vb] | 65 |
|
| 2 | it 's difficult for [pron] | 21 |
|
| 3 | 's difficult for [pron] [to-vb] | 15 |
|
| 4 | it 's for [pron] [to-vb] | 13 |
|
