| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] difficult | 732 |
|
| 2 | it [adv] difficult for | 165 |
|
| 3 | it is difficult for | 139 |
|
| 4 | is [adv] difficult for | 111 |
|
| 5 | it is [adv] for | 77 |
|
