| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] [verb] | 8603 |
|
| 2 | it [is] difficult [verb] | 1819 |
|
| 3 | it [is] [adv] difficult | 1308 |
|
| 4 | [is] [adv] difficult [verb] | 1228 |
|
| 5 | it [adv] difficult [verb] | 370 |
|
