| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] not [verb] that | 569 |
|
| 2 | [is] difficult [verb] that | 102 |
|
| 3 | [is] difficult not [verb] | 33 |
|
| 4 | difficult not [verb] that | 8 |
|
