| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | very difficult [prep] the | 53 |
|
| 2 | very difficult [prep] the | 53 |
|
| 3 | very difficult [prep] the | 53 |
|
| 4 | very difficult for the | 40 |
|
| 5 | very difficult for the | 40 |
|
| 6 | very difficult in the | 6 |
|
| 7 | very difficult in the | 6 |
|
