| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult [verb] | 2198 |
|
| 2 | it be difficult [to-vb] | 2183 |
|
| 3 | it be [adj] to believe | 275 |
|
| 4 | [pron] be difficult to believe | 84 |
|
| 5 | it be difficult to believe | 82 |
|
| 6 | it be difficult believe | 82 |
|
| 7 | [pers pn] be difficult to believe | 82 |
|
| 8 | it [be] difficult to believe | 82 |
|
