| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult [prep] | 218 |
|
| 2 | it is difficult [prep] | 218 |
|
| 3 | it is difficult for | 139 |
|
| 4 | it is difficult for | 139 |
|
| 5 | it is difficult to | 54 |
|
| 6 | it is difficult to | 54 |
|
| 7 | it is difficult in | 11 |
|
| 8 | it is difficult in | 11 |
|
| 9 | it is difficult at | 8 |
|
| 10 | it is difficult at | 8 |
|
