| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be more difficult [to-vb] [conj] | 9 |
|
| 2 | it be more difficult [verb] [conj] | 9 |
|
| 3 | it is more difficult [verb] [conj] | 9 |
|
| 4 | it be more difficult [verb] [subord] | 6 |
|
