| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be difficult [verb] | 2198 |
|
| 2 | it be [verb] [noun pl] | 256 |
|
| 3 | be difficult [verb] [noun pl] | 86 |
|
| 4 | it difficult [verb] [noun pl] | 56 |
|
