| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is difficult [verb] such a [noun] | 5 |
|
| 2 | is difficult [verb] such [art] [noun] | 5 |
|
| 3 | is difficult [verb] such [art] [noun] | 5 |
|
| 4 | [pron] is difficult [verb] such [noun] | 8 |
|
| 5 | it is difficult [verb] such [noun] | 8 |
|
| 6 | [pers pn] is difficult [verb] such [noun] | 8 |
|
| 7 | it is difficult [verb] such [noun] | 8 |
|
