| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult for us [to-vb] | 12 |
|
| 2 | it is difficult for us [to-vb] | 12 |
|
| 3 | [pron] is difficult for us [to-vb] | 12 |
|
| 4 | [pers pn] is difficult for us [to-vb] | 12 |
|
