| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] it [adv] difficult [verb] | 75 |
|
| 2 | [vb infin] it difficult [verb] [conj] | 23 |
|
| 3 | it [adv] difficult [verb] [conj] | 19 |
|
| 4 | [vb infin] it [adv] [verb] [conj] | 7 |
|
| 5 | [vb infin] it [adv] difficult [conj] | 6 |
|
