| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it difficult [to-vb] [det] [noun] | 20 |
|
| 2 | it difficult [verb] [det] [noun] | 20 |
|
| 3 | it difficult [verb] [det] [noun sg] | 12 |
|
| 4 | it difficult [verb] [det] [noun pl] | 8 |
|
