| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be difficult for us [to-vb] | 5 |
|
| 2 | [vb mod] be difficult for us [to-vb] | 5 |
|
| 3 | would be difficult [prep] us [to-vb] | 5 |
|
| 4 | [vb mod] be difficult [prep] us [to-vb] | 5 |
|
| 5 | [vb mod] be difficult [prep] us [to-vb] | 5 |
|
