| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] difficult [pers pn] can [be] [to-vb] | 6 |
|
| 2 | [Wh adv] difficult it can [be] [to-vb] | 6 |
|
| 3 | [Wh adv] difficult [pron] can be [to-vb] | 6 |
|
| 4 | [Wh adv] difficult it can [be] [to-vb] | 6 |
|
| 5 | how difficult [pron] can [be] [to-vb] | 6 |
|
