| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] it [be] [verb] [prep] | 1014 |
|
| 2 | [adv] difficult it [be] [verb] | 91 |
|
| 3 | [adv] difficult it [be] [prep] | 35 |
|
| 4 | difficult it [be] [verb] [prep] | 14 |
|
