| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] difficult [prep] us | 7 |
|
| 2 | it [is] [adv] difficult [prep] us | 7 |
|
| 3 | it [is] very difficult [prep] us | 6 |
|
| 4 | it [is] very difficult [prep] us | 6 |
|
| 5 | it [is] difficult [prep] us [verb] | 15 |
|
| 6 | it [is] difficult [prep] us [to-vb] | 15 |
|
