| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] 's difficult [verb] [subord] | 6 |
|
| 2 | [pron] 's difficult [to-vb] [subord] | 6 |
|
| 3 | it 's difficult [verb] [subord] | 6 |
|
| 4 | it 's difficult [verb] [subord] | 6 |
|
