| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] not [verb] that | 569 |
|
| 2 | [is] not difficult [verb] | 169 |
|
| 3 | [is] difficult [verb] that | 102 |
|
| 4 | not difficult [verb] that | 21 |
|
