| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [Wh adv] [pron] [is] difficult [verb] | 7 |
|
| 2 | [noun pl] [Wh adv] [pron] [is] difficult [verb] | 5 |
|
| 3 | [Wh adv] [pron] [is] [adv] difficult [verb] | 9 |
|
| 4 | [Wh adv] [pron] [is] [adv] difficult [verb] | 8 |
|
