| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] difficult [verb] | 919 |
|
| 2 | as it [is] [adv] [verb] | 222 |
|
| 3 | as it [is] difficult [verb] | 18 |
|
| 4 | as it [is] [adv] difficult | 11 |
|
