| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [adv] difficult [conj] it is | 6 |
|
| 2 | [adv] difficult [to-vb] [conj] it is | 10 |
|
| 3 | [adv] difficult [verb] [conj] it is | 10 |
|
