| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] difficult it [vb mod] [be] [verb] | 20 |
|
| 2 | [Wh adv] difficult it [modal v] [be] [verb] | 20 |
|
| 3 | [Wh adv] [adj] it can [be] [verb] | 17 |
|
| 4 | [Wh adv] difficult it can [be] [verb] | 7 |
|
| 5 | [adv] difficult it can [be] [verb] | 7 |
|
| 6 | [Wh adv] difficult [pron] can [be] [verb] | 7 |
|
| 7 | [Wh adv] difficult it can [be] [verb] | 7 |
|
