| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | know [adv] [adj] [pron] [be] [prep] | 24 |
|
| 2 | [verb] [adv] difficult [pron] [be] [prep] | 22 |
|
| 3 | [vb base] [adv] difficult [pron] [be] [prep] | 8 |
|
| 4 | know [adv] difficult [pron] [be] [prep] | 6 |
|
