| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult [verb] | 1529 |
|
| 2 | it is [adj] believe | 150 |
|
| 3 | it be difficult believe | 82 |
|
| 4 | it [be] difficult believe | 82 |
|
| 5 | it [is] difficult believe | 61 |
|
| 6 | [pron] is difficult believe | 57 |
|
| 7 | it is difficult believe | 55 |
|
| 8 | [pers pn] is difficult believe | 55 |
|
