| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adj] not | 339 |
|
| 2 | it [is] difficult [adv] | 91 |
|
| 3 | it [be] difficult not | 50 |
|
| 4 | [pron] [is] difficult not | 36 |
|
| 5 | [pers pn] [is] difficult not | 36 |
|
| 6 | it [is] difficult [not/n't] | 36 |
|
| 7 | it [is] difficult not | 36 |
|
| 8 | it [is] difficult not | 36 |
|
