| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] how difficult [pron] is for | 13 |
|
| 2 | know how [adj] [pron] is for | 7 |
|
| 3 | [vb base] how difficult [pron] is for | 7 |
|
| 4 | know how difficult [pron] is [prep] | 6 |
|
| 5 | know how difficult [pron] is for | 5 |
|
| 6 | know [adv] difficult [pron] is for | 5 |
|
| 7 | know how difficult [pron] [be] for | 5 |
|
| 8 | know how difficult [pron] be for | 5 |
|
| 9 | know how difficult [pron] [is] for | 5 |
|
