| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] it [verb] [adj] [noun] | 129 |
|
| 2 | it difficult [verb] [adj] [noun] | 65 |
|
| 3 | [vb past] it difficult [verb] [adj] | 29 |
|
| 4 | [vb past] it difficult [verb] [noun] | 26 |
|
