| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] found [pers pn] difficult [verb] | 29 |
|
| 2 | [noun prp] [vb past] it difficult [verb] | 29 |
|
| 3 | [noun prp] [vb past] [pers pn] difficult [to-vb] | 28 |
|
