| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [verb] [conj] [vb infin] | 50 |
|
| 2 | it [adv] difficult [verb] [conj] | 19 |
|
| 3 | it difficult [verb] [conj] [vb infin] | 13 |
|
| 4 | it [adv] [verb] [conj] [vb infin] | 9 |
|
