| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it very difficult [prep] us | 5 |
|
| 2 | it very difficult for us | 5 |
|
| 3 | it very difficult for us | 5 |
|
| 4 | it very difficult [prep] us | 5 |
|
| 5 | it very difficult [prep] us | 5 |
|
