| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] difficult [pers pn] is for | 17 |
|
| 2 | how difficult [pron] is for | 17 |
|
| 3 | [Wh adv] difficult [pron] is for | 17 |
|
| 4 | [Wh adv] difficult it is for | 17 |
|
| 5 | [Wh adv] difficult it is for | 17 |
|
