| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] difficult for us [to-vb] | 15 |
|
| 2 | it [is] difficult for us [verb] | 15 |
|
| 3 | it [is] difficult for us [verb] | 15 |
|
| 4 | it is difficult for us [verb] | 12 |
|
