| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [to-vb] [is] not it | 9 |
|
| 2 | difficult [to-vb] [is] not [pers pn] | 9 |
|
| 3 | difficult [to-vb] [is] not [pron] | 9 |
|
| 4 | difficult [to-vb] [is] not it | 9 |
|
