| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] very difficult [verb] | 137 |
|
| 2 | [pron] difficult [verb] [conj] | 81 |
|
| 3 | very difficult [verb] [conj] | 65 |
|
| 4 | [pron] very difficult [conj] | 9 |
|
