| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] be [prep] [pron] | 255 |
|
| 2 | it be difficult [prep] [pron] | 102 |
|
| 3 | it [vb mod] be difficult [prep] | 100 |
|
| 4 | [vb mod] be difficult [prep] [pron] | 42 |
|
