| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] it [prep] | 3342 |
|
| 2 | it difficult [prep] | 255 |
|
| 3 | [vb pp] it difficult | 92 |
|
| 4 | [vb pp] difficult [prep] | 12 |
|
