| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] not [adj] [verb] [conj] | 214 |
|
| 2 | [is] [adv] difficult [verb] [conj] | 126 |
|
| 3 | [be] not difficult [verb] [conj] | 28 |
|
| 4 | [is] not difficult [verb] [conj] | 19 |
|
| 5 | [is] [not/n't] difficult [verb] [conj] | 19 |
|
