| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult [verb] | 1529 |
|
| 2 | it is [adj] see | 735 |
|
| 3 | it be difficult see | 235 |
|
| 4 | it [be] difficult see | 235 |
|
| 5 | it [is] difficult see | 203 |
|
| 6 | [pron] is difficult see | 186 |
|
| 7 | it is difficult see | 185 |
|
| 8 | [pers pn] is difficult see | 185 |
|
