| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [verb] [that] | 1206 |
|
| 2 | it is [adv] difficult [verb] | 558 |
|
| 3 | it is difficult [verb] [that] | 97 |
|
| 4 | is [adv] difficult [verb] [that] | 15 |
|
| 5 | it [adv] difficult [verb] [that] | 5 |
|
