| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult [verb] [pron] the | 14 |
|
| 2 | it be difficult [to-vb] [pron] the | 14 |
|
| 3 | it be difficult [verb] what the | 13 |
|
| 4 | it be difficult [verb] what the | 13 |
|
| 5 | it be difficult [verb] [Wh det] the | 13 |
|
| 6 | it is difficult [verb] [pron] the | 10 |
|
