| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [verb] [adj] | 2417 |
|
| 2 | it be difficult [verb] | 2198 |
|
| 3 | be difficult [verb] [adj] | 329 |
|
| 4 | it difficult [verb] [adj] | 118 |
|
| 5 | it be difficult [adj] | 5 |
|
