| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult for them | 13 |
|
| 2 | [pron] is difficult for them | 13 |
|
| 3 | it is difficult for them | 13 |
|
| 4 | [pers pn] is difficult for them | 13 |
|
| 5 | is [adv] difficult for them | 6 |
|
| 6 | is [adv] difficult for them | 6 |
|
| 7 | is difficult for them [verb] | 12 |
|
| 8 | is difficult for them [to-vb] | 12 |
|
