| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [adv] difficult [verb] | 370 |
|
| 2 | it [adv] difficult [verb] | 370 |
|
| 3 | it extremely [adj] [verb] | 42 |
|
| 4 | [pers pn] extremely difficult [verb] | 32 |
|
| 5 | [pron] extremely difficult [verb] | 32 |
|
| 6 | it extremely difficult [verb] | 31 |
|
| 7 | it extremely difficult [verb] | 31 |
|
