| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be not difficult [verb] that | 20 |
|
| 2 | be not difficult [to-vb] that | 20 |
|
| 3 | is not difficult [verb] that | 15 |
|
| 4 | be not difficult to see that | 7 |
|
| 5 | be not difficult see that | 7 |
|
