| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [verb] | 4623 |
|
| 2 | it is difficult [verb] | 1529 |
|
| 3 | is [adv] difficult [verb] | 830 |
|
| 4 | it is [adv] difficult | 732 |
|
| 5 | it [adv] difficult [verb] | 370 |
|
