| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it more difficult [prep] | 70 |
|
| 2 | [verb] it difficult [prep] [adj] | 35 |
|
| 3 | it more difficult [prep] [adj] | 13 |
|
| 4 | [verb] more difficult [prep] [adj] | 7 |
|
