| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [adv] difficult [verb] | 875 |
|
| 2 | since it [be] [adv] [verb] | 49 |
|
| 3 | since it [be] difficult [verb] | 16 |
|
| 4 | since it [be] [adv] difficult | 6 |
|
