| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | know it [is] [adv] [adj] | 110 |
|
| 2 | [verb] it [is] [adv] difficult | 48 |
|
| 3 | know it [be] [adv] difficult | 9 |
|
| 4 | know [pron] [is] [adv] difficult | 8 |
|
