| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] difficult [to-vb] [adj] [noun] | 208 |
|
| 2 | [be] [adj] [to-vb] such [noun] | 143 |
|
| 3 | [be] difficult [verb] such [noun] | 9 |
|
