| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] difficult it is [prep] | 21 |
|
| 2 | [vb base] [Wh adv] difficult it is | 14 |
|
| 3 | [vb base] [Wh adv] it is [prep] | 12 |
|
