| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [verb] that | 1409 |
|
| 2 | is [adv] difficult [verb] | 830 |
|
| 3 | is difficult [verb] that | 97 |
|
| 4 | [adv] difficult [verb] that | 50 |
|
