| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [vb past] it [verb] | 868 |
|
| 2 | [vb past] it difficult [verb] | 284 |
|
| 3 | [noun] [vb past] it difficult | 140 |
|
| 4 | [noun] [vb past] difficult [verb] | 25 |
|
