| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [is] not [verb] [conj] | 320 |
|
| 2 | [pron] [is] difficult [verb] [conj] | 181 |
|
| 3 | [pron] [is] difficult not [verb] | 32 |
|
| 4 | [is] difficult not [verb] [conj] | 7 |
|
