| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it [verb] [adv prt] [prep] | 374 |
|
| 2 | [verb] it difficult [verb] [prep] | 153 |
|
| 3 | [verb] it difficult [verb] [adv prt] | 61 |
|
| 4 | it difficult [verb] [adv prt] [prep] | 24 |
|
| 5 | [verb] difficult [verb] [adv prt] [prep] | 6 |
|
