| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [is] [adj] not [verb] that | 13 |
|
| 2 | [pron] [is] difficult [adv] [verb] that | 8 |
|
| 3 | [pron] [be] difficult not [verb] that | 7 |
|
| 4 | [pron] [is] difficult not [verb] [conj] | 7 |
|
