| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult for us [verb] | 24 |
|
| 2 | [adv] difficult for us [verb] | 17 |
|
| 3 | be [adv] difficult for us | 15 |
|
| 4 | be [adv] for us [verb] | 12 |
|
