| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it difficult for [pron] [to-vb] | 65 |
|
| 2 | it was difficult for [pron] | 22 |
|
| 3 | it was for [pron] [to-vb] | 21 |
|
| 4 | was difficult for [pron] [to-vb] | 20 |
|
