| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [pron] can be [verb] | 7 |
|
| 2 | how difficult [pron] can be [verb] | 7 |
|
| 3 | [Wh adv] difficult [pron] can be [verb] | 7 |
|
| 4 | how difficult [pron] can be [verb] | 7 |
|
