| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it difficult [prep] [pers pn] [to-vb] | 63 |
|
| 2 | it 's difficult [prep] [pers pn] | 18 |
|
| 3 | it 's [prep] [pers pn] [to-vb] | 14 |
|
| 4 | 's difficult [prep] [pers pn] [to-vb] | 13 |
|
