| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [adv] difficult [to-vb] [coord] [vb infin] | 8 |
|
| 2 | it [adv] difficult [verb] [coord] [vb infin] | 8 |
|
| 3 | it [adv] difficult [verb] and [vb infin] | 7 |
|
