| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult [verb] | 2198 |
|
| 2 | it be [verb] [noun] | 1321 |
|
| 3 | be difficult [verb] [noun] | 222 |
|
| 4 | it difficult [verb] [noun] | 119 |
|
| 5 | it be difficult [noun] | 9 |
|
