| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it was difficult [verb] [pron] [prep] | 5 |
|
| 2 | it was difficult [verb] [pers pn] [prep] | 5 |
|
| 3 | it was difficult [to-vb] [pron] [prep] | 5 |
|
