| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] difficult for | 75 |
|
| 2 | [subord] it is [adv] difficult | 55 |
|
| 3 | [subord] it is difficult for | 13 |
|
| 4 | [subord] it is [adv] for | 5 |
|
