| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is difficult [to-vb] that [det] | 14 |
|
| 2 | is difficult [verb] that this | 7 |
|
| 3 | is difficult believe that [det] | 6 |
|
| 4 | is difficult to believe that [det] | 6 |
|
