| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [prep] [pers pn] [to-vb] | 280 |
|
| 2 | it [prep] [pers pn] [to-vb] | 116 |
|
| 3 | it difficult [prep] [pers pn] | 75 |
|
