| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] 's very difficult [verb] [conj] | 8 |
|
| 2 | it 's very difficult [verb] [conj] | 8 |
|
| 3 | [pers pn] 's very difficult [to-vb] [conj] | 8 |
|
| 4 | [pers pn] 's very difficult [verb] [subord] | 6 |
|
