| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [pron] [be] [adj] not [verb] | 109 |
|
| 2 | [conj] [pron] [be] difficult [adv] [verb] | 20 |
|
| 3 | [conj] [pron] [be] difficult not [verb] | 10 |
|
| 4 | [conj] [pron] [be] difficult [not/n't] [verb] | 10 |
|
