| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult for them [verb] [adj] [noun] | 11 |
|
| 2 | difficult [prep] them [to-vb] [adj] [noun] | 11 |
|
| 3 | difficult [prep] them [verb] [adj] [noun] | 9 |
|
| 4 | difficult [prep] them [verb] [adj] [noun pl] | 7 |
|
