| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] it [is] [verb] | 688 |
|
| 2 | [Wh adv] difficult it [is] | 80 |
|
| 3 | difficult it [is] [verb] | 70 |
|
| 4 | [Wh adv] difficult it [verb] | 9 |
|
