| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult [verb] [noun] | 169 |
|
| 2 | it be [verb] this [noun] | 53 |
|
| 3 | it be difficult [verb] this | 27 |
|
| 4 | be difficult [verb] this [noun] | 20 |
|
