| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [prep] the [noun] | 200 |
|
| 2 | more difficult [prep] the [noun] | 61 |
|
| 3 | more difficult [to-vb] the [noun] | 50 |
|
| 4 | more [to-vb] [prep] the [noun] | 32 |
|
| 5 | more difficult [to-vb] [prep] [noun] | 27 |
|
| 6 | more difficult [to-vb] [prep] the | 23 |
|
