| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [adv] difficult [to-vb] and | 8 |
|
| 2 | it [be] [adv] difficult [to-vb] and | 8 |
|
| 3 | it [is] [adv] difficult [to-vb] and | 6 |
|
| 4 | it is [adv] difficult [to-vb] and | 5 |
|
