| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is not difficult [verb] | 140 |
|
| 2 | it is difficult [verb] [that] | 97 |
|
| 3 | it is not [verb] [that] | 82 |
|
| 4 | is not difficult [verb] [that] | 15 |
|
