| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adj] not [verb] | 272 |
|
| 2 | it [is] difficult [adv] [verb] | 67 |
|
| 3 | it [be] difficult not [verb] | 40 |
|
| 4 | [pers pn] [is] difficult not [verb] | 32 |
|
| 5 | [pron] [is] difficult not [verb] | 32 |
|
| 6 | it [is] difficult not [verb] | 32 |
|
| 7 | it [is] difficult [not/n't] [verb] | 32 |
|
| 8 | it [is] difficult not [verb] | 32 |
|
