| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is difficult [verb] [art] [noun] | 230 |
|
| 2 | is [verb] such [art] [noun] | 20 |
|
| 3 | difficult [verb] such [art] [noun] | 11 |
|
| 4 | is difficult [verb] such [noun] | 8 |
|
| 5 | is difficult [verb] such [art] | 5 |
|
