| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [adv] difficult | 1332 |
|
| 2 | as it [be] [adv] | 896 |
|
| 3 | as it [be] difficult | 27 |
|
| 4 | as [be] [adv] difficult | 6 |
|
