| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] it difficult for | 29 |
|
| 2 | [vb base] [pers pn] difficult for | 29 |
|
| 3 | make [pron] difficult for | 29 |
|
| 4 | [vb base] it difficult for | 29 |
|
