| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | more difficult [to-vb] [prep] [noun] | 27 |
|
| 2 | more difficult [to-vb] [prep] [noun sg] | 12 |
|
| 3 | more difficult [to-vb] [prep] [noun pl] | 11 |
|
| 4 | more difficult [to-vb] with [noun] | 6 |
|
