| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it [is] [adv] difficult [verb] | 217 |
|
| 2 | as it [is] [adv] [adj] [verb] | 43 |
|
| 3 | as it [be] [adv] difficult [verb] | 7 |
|
| 4 | as [pron] [is] [adv] difficult [verb] | 6 |
|
