| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] difficult | 732 |
|
| 2 | it is [adv] [coord] | 107 |
|
| 3 | is [adv] difficult [coord] | 46 |
|
| 4 | it is difficult [coord] | 14 |
|
| 5 | it [adv] difficult [coord] | 10 |
|
