| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] difficult [verb] [coord] | 7 |
|
| 2 | it [is] [adv] difficult [to-vb] [coord] | 7 |
|
| 3 | it is [adv] difficult [verb] [coord] | 6 |
|
| 4 | it [is] [adv] difficult [verb] and | 6 |
|
