| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult [verb] | 2198 |
|
| 2 | it be [adj] think | 276 |
|
| 3 | it [be] difficult think | 30 |
|
| 4 | [pers pn] be difficult think | 30 |
|
| 5 | [pron] be difficult think | 30 |
|
| 6 | it be difficult think | 30 |
|
