| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] it [adv] difficult [verb] a | 10 |
|
| 2 | [vb base] it [adv] difficult [to-vb] a | 10 |
|
| 3 | find it [adv] difficult [verb] a | 9 |
|
