| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] is difficult for | 145 |
|
| 2 | [pron] is difficult for | 145 |
|
| 3 | [pers pn] is difficult for | 140 |
|
| 4 | it is difficult for | 139 |
|
| 5 | it is difficult for | 139 |
|
