| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] difficult in | 7 |
|
| 2 | it is [adv] difficult in | 7 |
|
| 3 | it is difficult [to-vb] in | 11 |
|
| 4 | it is difficult [verb] in | 11 |
|
| 5 | it is difficult in [adj] | 6 |
|
