| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [adv] difficult [to-vb] [that] | 5 |
|
| 2 | [pers pn] [adv] difficult [verb] [that] | 5 |
|
| 3 | [pron] [adv] difficult [verb] that | 5 |
|
| 4 | it [adv] difficult [verb] [that] | 5 |
|
| 5 | it [adv] difficult [verb] [that] | 5 |
|
