| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] [adj] it | 1686 |
|
| 2 | [adv] difficult it | 216 |
|
| 3 | [Wh adv] difficult [pron] | 178 |
|
| 4 | [Wh adv] difficult [pers pn] | 172 |
|
| 5 | [Wh adv] difficult it | 159 |
|
