| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [adv] difficult [to-vb] that | 17 |
|
| 2 | it be [adv] difficult [verb] that | 17 |
|
| 3 | it be [adv] difficult [verb] that | 17 |
|
| 4 | it is [adv] difficult [verb] that | 13 |
|
