| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [Wh adv] difficult [pers pn] is for | 13 |
|
| 2 | [vb base] [Wh adv] difficult [pers pn] is for | 7 |
|
| 3 | know [Wh adv] difficult [pers pn] is for | 5 |
|
| 4 | know [Wh adv] difficult [pers pn] is for | 5 |
|
| 5 | [Wh adv] difficult [pers pn] is for [noun] | 8 |
|
| 6 | [Wh adv] difficult [pers pn] is for [noun pl] | 6 |
|
