| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult [prep] us | 16 |
|
| 2 | it is difficult [prep] us | 16 |
|
| 3 | [pron] is difficult [prep] us | 16 |
|
| 4 | [pers pn] is difficult [prep] us | 16 |
|
| 5 | is [adv] difficult [prep] us | 5 |
|
| 6 | is [adv] difficult [prep] us | 5 |
|
| 7 | is difficult [prep] us [to-vb] | 13 |
|
| 8 | is difficult [prep] us [verb] | 13 |
|
