| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] it difficult for [pron] [to-vb] | 6 |
|
| 2 | [vb base] it difficult for [pers pn] [to-vb] | 6 |
|
| 3 | [vb base] it difficult for [pron] [to-vb] | 6 |
|
| 4 | make it difficult for [pron] [to-vb] | 6 |
|
