| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] difficult for them [to-vb] | 27 |
|
| 2 | it difficult for them [to-vb] | 20 |
|
| 3 | it [be] difficult for them | 17 |
|
| 4 | it [be] for them [to-vb] | 11 |
|
