| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] [is] difficult [prep] us | 19 |
|
| 2 | [pers pn] [is] difficult for us | 19 |
|
| 3 | it [is] difficult [prep] us | 19 |
|
| 4 | [pers pn] is difficult [prep] us | 16 |
|
