| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] very difficult [to-vb] [conj] | 7 |
|
| 2 | [pers pn] very difficult [verb] [conj] | 7 |
|
| 3 | it very difficult [verb] [conj] | 7 |
|
| 4 | it very difficult [verb] [conj] | 7 |
|
