| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adj] [verb] | 13645 |
|
| 2 | it is [adj] [verb] | 12797 |
|
| 3 | it be difficult [verb] | 2198 |
|
| 4 | it [be] difficult [verb] | 2198 |
|
| 5 | it [is] difficult [verb] | 1819 |
|
| 6 | [pron] is difficult [verb] | 1559 |
|
| 7 | [pers pn] is difficult [verb] | 1533 |
|
| 8 | it is difficult [verb] | 1529 |
|
| 9 | it is difficult [verb] | 1529 |
|
