| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that it be often difficult [verb] | 11 |
|
| 2 | that it be often difficult [to-vb] | 11 |
|
| 3 | that it be often difficult [verb] | 11 |
|
| 4 | that it be often difficult [verb] | 11 |
|
| 5 | that it is often difficult [verb] | 9 |
|
