| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult it is for [noun] [to-vb] | 8 |
|
| 2 | difficult it is for [noun] [verb] | 8 |
|
| 3 | difficult it is for [noun] [verb] | 8 |
|
| 4 | difficult it is for [noun pl] [verb] | 6 |
|
