| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [adv] difficult [verb] | 875 |
|
| 2 | [vb base] it [be] [adv] [verb] | 133 |
|
| 3 | [vb base] it [adv] difficult [verb] | 90 |
|
| 4 | [vb base] it [be] [adv] difficult | 27 |
|
| 5 | [vb base] it [be] difficult [verb] | 21 |
|
