| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it difficult for them [verb] | 20 |
|
| 2 | it [is] difficult for them | 14 |
|
| 3 | [is] difficult for them [verb] | 12 |
|
| 4 | it [is] for them [verb] | 11 |
|
