| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] difficult [verb] [noun] | 222 |
|
| 2 | [be] [verb] such [noun] | 144 |
|
| 3 | difficult [verb] such [noun] | 21 |
|
| 4 | [be] difficult [verb] such | 18 |
|
